Saving 10 minutes a day adds up to about 60.8 hours a year, and 30 minutes a day to more than 7 full days
If you save 10 minutes a day, you get 10 minutes × 365 days = 3,650 minutes a year, or about 60.8 hours. Divided into 24-hour days, that is 2 days 12 hours 50 minutes. Saving 30 minutes a day gives 182.5 hours a year (7 days 14 hours 30 minutes) and 1,825 hours over 10 years. A few minutes a day barely registers on any single day, but over a year or a decade it becomes days and then weeks.
The calculator above takes, for each habit, the minutes you save each time and how many days a week you do it. It returns your daily average, a week, a month, a year and a total for the period you pick. It shows each habit's share as a bar and the saved time as a grid of blocks, and it tells you on which day starting today you would reach 100 hours or 1,000 hours. The three starting examples (20 minutes less phone time every day, 12 minutes fewer commute transfers 5 days a week, and a 40-minute online grocery order once a week) add up to 208.6 hours a year, or 8 days 16 hours 34 minutes.
Why work out small amounts of time over a whole year
A change that saves a few minutes a day is hard to judge on the spot. Put the same minutes on a one-year or ten-year scale, and the changes worth making separate themselves from the ones that are not. It helps most in situations like these.
- Cutting back on TV or screen time: in the BLS American Time Use Survey for 2025, watching television averaged 2.61 hours a day. Cutting just 10% of that, 15.7 minutes, would free about 95.3 hours over a year.
- Comparing commutes or neighborhoods: a route that is 6 minutes shorter each way saves 12 minutes a day, and at 5 workdays a week that is about 52.1 hours a year. You can enter the two routes as two habit rows and compare them.
- Deciding whether to learn a shortcut or automate a task: if the time saved over 5 years is more than the time it takes to learn or build it, it is worth trying. The "Time you can spend on the change and still break even" row shows that number.
- Talking about time management with kids or students: showing how a few minutes a day turn into blocks over a year is easier to follow than describing it.
How the calculation works
- Weekly total = for each habit, minutes saved each time × days a week you do it, added together.
- Daily average = weekly total ÷ 7.
- One year = weekly total × 365 ÷ 7. That treats a year as 52.14 weeks, and for a habit you do every day it equals minutes × 365. The extra day in a leap year is not counted.
- One month = one year ÷ 12 (an average of 30.4 days), and the period = one year × the number of years.
- Conversions: days, hours and minutes in 24-hour days come from the total rounded to the nearest minute. Workdays = total ÷ 480 minutes (8 hours), and the share of the 24-hour day = daily average ÷ 1,440 minutes.
- Day you reach a goal: counting today as day 1, it is day ⌈goal hours × 60 ÷ daily average⌉. For example, at a daily average of 30 minutes, 100 hours is 6,000 minutes ÷ 30 = day 200.
- Time blocks: the total is split into 1-hour blocks. If that would be more than 400 blocks, the grid switches to blocks of 1 day (24 hours), then 1 week (168 hours), then 1 year. Habits are filled in the order you entered them, and the last block is filled only to the remaining fraction.
Total by minutes saved per day
These are the totals if you save the same time every day. The "1 year (in 24-hour days)" column divides the one-year total into 24-hour days.
| Per day | 1 week | 1 year | 1 year (in 24-hour days) | 5 years | 10 years |
|---|---|---|---|---|---|
| 5 minutes | 35 minutes | 30.4 hours | 1 day 6 hours 25 minutes | 152.1 hours | 304.2 hours |
| 10 minutes | 1 hour 10 minutes | 60.8 hours | 2 days 12 hours 50 minutes | 304.2 hours | 608.3 hours |
| 15 minutes | 1 hour 45 minutes | 91.3 hours | 3 days 19 hours 15 minutes | 456.3 hours | 912.5 hours |
| 20 minutes | 2 hours 20 minutes | 121.7 hours | 5 days 1 hour 40 minutes | 608.3 hours | 1,216.7 hours |
| 30 minutes | 3 hours 30 minutes | 182.5 hours | 7 days 14 hours 30 minutes | 912.5 hours | 1,825 hours |
| 1 hour | 7 hours | 365 hours | 15 days 5 hours | 1,825 hours | 3,650 hours |
Saving 1 hour a day gives 365 hours a year, which is 15 days 5 hours in 24-hour days. Counted as 8-hour workdays, that is about 45.6 days, more than a month and a half of full-time work.
Habits you don't do every day
Time that only exists on workdays, like a commute or a meeting, is badly overstated if you enter it as daily. This table shows the one-year total for saving 15 minutes each time, depending on how many days a week you do it.
| Days you do it | 1-year total | Compared with every day |
|---|---|---|
| Every day | 91.3 hours | 100% |
| 6 days a week | 78.2 hours | 86% |
| 5 days a week | 65.2 hours | 71% |
| 4 days a week | 52.1 hours | 57% |
| 3 days a week | 39.1 hours | 43% |
| 2 days a week | 26.1 hours | 29% |
| 1 day a week | 13 hours | 14% |
Entering a 5-day habit as daily makes the one-year total come out 1.4 times too high. Five days a week is counted as 52.14 weeks × 5 = 260.7 days a year, which is almost the same as the 261 weekdays (Monday to Friday) in 2026. Holidays and vacation days are not subtracted, so reduce the result by that much.
Where an average day goes
These official figures can help you choose where to look for time. They come from the U.S. Bureau of Labor Statistics' American Time Use Survey, 2025 results, released on June 25, 2026. The table lists average hours per day for two activities and shows what cutting 10% of each would add up to over a year.
| Activity (average per day) | 2025 | 10% less per day | Per year |
|---|---|---|---|
| Watching television | 2.61 hours | 15.7 minutes | 95.3 hours |
| Playing games and computer use for leisure | 37 minutes | 3.7 minutes | 22.5 hours |
In the same survey, watching television was the leisure activity that took the most time, at about 2.6 hours a day, and sleeping averaged 9.03 hours a day, including naps and time lying awake. Leisure games and computer use rose to 37 minutes a day from 25 minutes in 2015. The survey's tables have no separate commuting line, because travel is counted with each activity, so the table has no commute row. Sleep is not something to cut, so the more realistic places to find time are activities you can change how you do, such as how you watch or play.
Goals your saved time can reach
If you pooled all the time you save in one place, this is the day you would reach each target at your daily average. Today counts as day 1.
| Daily average | 24 hours | 100 hours | 1,000 hours | 10,000 hours |
|---|---|---|---|---|
| 10 minutes | Day 144 | Day 600 (about 1.6 years) | Day 6,000 (about 16.4 years) | Day 60,000 (about 164.4 years) |
| 30 minutes | Day 48 | Day 200 | Day 2,000 (about 5.5 years) | Day 20,000 (about 54.8 years) |
| 1 hour | Day 24 | Day 100 | Day 1,000 (about 2.7 years) | Day 10,000 (about 27.4 years) |
| 2 hours | Day 12 | Day 50 | Day 500 (about 1.4 years) | Day 5,000 (about 13.7 years) |
Saving 30 minutes every day gets you to 100 hours on day 200 and to 1,000 hours in about 5.5 years. 10,000 hours is the number behind the popular "10,000-hour rule," but in a meta-analysis of practice and performance (Macnamara et al., 2014), deliberate practice explained 26% of the differences in performance for games, 21% for music, 18% for sports, 4% for education and less than 1% for professions. Accumulated time is a starting point, and what you practice and how you practice it matter as well.
How much time is it worth spending on a change?
The webcomic xkcd 1205, "Is It Worth the Time?", asks how long you can work on making a routine task more efficient before you spend more time than you save, and answers with a table based on 5 years. The time you save over 5 years is the most you can spend learning or automating the fix.
| Time saved and how often | 5-year total | In 24-hour days |
|---|---|---|
| Keyboard shortcut: 5 seconds, 50 times a day | 126.7 hours | 5 days 6 hours 44 minutes |
| 1 minute, once a day | 30.4 hours | 1 day 6 hours 25 minutes |
| 5 minutes, once a day | 152.1 hours | 6 days 8 hours 5 minutes |
| 5 minutes, 5 times a day | 760.4 hours | 31 days 16 hours 25 minutes |
| 30 minutes, once a week | 130.4 hours | 5 days 10 hours 21 minutes |
| 1 hour, once a week | 260.7 hours | 10 days 20 hours 43 minutes |
For example, if automating a weekly 30-minute cleanup takes 20 hours, you save 130.4 hours over 5 years, which is far more than you spend. On the other hand, spending 40 hours to shave 1 minute off a daily task will not pay for itself within 5 years. The mouseover text on the original comic also reminds you to count the time spent looking up the table. In the calculator, enter things you do many times a day as a daily total of minutes (5 seconds × 50 times is about 4.2 minutes).
Common mistakes
- Multiplying a month by 30 days: 30 days × 12 months is 360 days, so the one-year total comes out about 5 days' worth too low. This calculator uses one month = one year ÷ 12 (an average of 30.4 days).
- Entering a 5-day habit as daily: for time that only exists on workdays, such as a commute or meetings, pick "5 days/week". Entering it as daily inflates it by 1.4 times.
- Entering something you do several times a day as a single time: the shorter the time saved each time, the more the number of repetitions drives the total. Enter the minutes multiplied by the times per day.
- Not subtracting the setup time: the time you spend learning or configuring a new app has to come off the saved time to get what you really keep.
- Assuming the calculated time simply appears: if you don't decide what the saved time is for, the time you calculate and the time you actually end up with can differ. Writing the date from a goal card on your calendar helps.
Limits and cautions
- A year is fixed at 365 days. The extra day in a leap year, holidays, vacations and sick days are not included.
- The day you reach a goal is a rough estimate based on the daily average. For habits you do only some days a week, the real date can differ by a few days depending on which weekdays the time builds up.
- The minutes saved each time are an estimate you enter yourself. To know whether you really saved that much, you need to track it.
- The calculator does not convert saved time into money or judge quality of life.
- Your entries are calculated only in your browser. If you turn on "Save in this browser," they stay only in this device's browser, and turning it off deletes the saved list.
As of The BLS figures were checked against the BLS release and tables on 2026-10-15, xkcd 1205 against the original comic page on the same day, and Macnamara 2014 against the abstract on the same day.
Sources
- 01U.S. Bureau of Labor Statistics, American Time Use Survey, 2025 results, news release USDL-26-1022 (2026-06-25)Watching television 2.61 hours a day, the leisure activity with the most time; sleeping 9.03 hours a day, including naps and time lying awake (Table 1); playing games and computer use for leisure 0.62 hours a day, 37 minutes against 25 minutes in 2015 (Table 11A).
- 02xkcd 1205, "Is It Worth the Time?""How long can you work on making a routine task more efficient before you're spending more time than you save? (across five years)" A break-even table based on 5 years.
- 03Macnamara BN, Hambrick DZ, Oswald FL. Deliberate practice and performance in music, games, sports, education, and professions: a meta-analysis. Psychol Sci 2014;25(8):1608–1618Share of performance differences explained by deliberate practice: games 26%, music 21%, sports 18%, education 4%, professions less than 1%.
Frequently asked questions
How many hours a year is 10 minutes a day?
10 minutes × 365 days = 3,650 minutes, or about 60.8 hours. In 24-hour days that is 2 days 12 hours 50 minutes, and over 10 years it is about 608.3 hours. At 30 minutes a day, you get 182.5 hours a year (7 days 14 hours 30 minutes).
How do I calculate a habit I only do 5 days a week?
Minutes saved each time × 5 days × 365 ÷ 7, which treats a year as 52.14 weeks. Saving 15 minutes every day gives 91.3 hours a year, but saving it only on 5 workdays a week gives 65.2 hours, or 71% of the daily figure. Holidays and vacation days are not subtracted, so reduce the result by that much.
Is a month counted as 30 days?
No. A month is the one-year total divided by 12 (an average of 30.4 days). Multiplying by 30 days and adding 12 months gives a 360-day year, so the yearly total would come out about 5 days' worth too low.
How do I enter something that saves time many times a day, like a keyboard shortcut?
Enter the total of all the time you save in a day. Saving 5 seconds 50 times a day is 250 seconds, or about 4.2 minutes, so enter 4.2 and choose every day. The minutes field accepts decimals.
What is the time I can spend on a change and still break even?
It is the total time you save over 5 years, the same basis used by the webcomic xkcd 1205, "Is It Worth the Time?" Trimming 1 minute from a daily task saves about 30.4 hours over 5 years, so spending more than about 30.4 hours learning or automating it will not pay off within 5 years.
How is the share of the 24-hour day calculated?
Your daily average of minutes saved is divided by the 1,440 minutes in a day. At 30 minutes a day, that is about 2.1%. It is also the share of the 8,760 hours in a year that you save.
Are my entries saved?
Not by default. If you turn on "Save in this browser," your habit list and period are kept only in this device's browser, and nothing is sent to a server.
Will 10,000 hours make me an expert?
Time alone does not decide it. In a meta-analysis of deliberate practice and performance (Macnamara et al., 2014), practice explained 26% of the differences in performance for games, 21% for music, 18% for sports, 4% for education and less than 1% for professions. The calculator's 10,000 hours is a benchmark for how much saved time piles up.