8 hours of 24 is 33% 10 hours of 24 is 41% 12 hours of 24 is 50% 5 days out of 7 is 71% ergo [8]=21% [10]=29% [12]=35% so that's the percentages of a week you s

8 hours of 24 is 33% 10 hours of 24 is 41% 12 hours of 24 is 50% 5 days out of 7 is 71% ergo [8]=21% [10]=29% [12]=35% so that's the percentages of a week you spend at work 50 weeks out of 52 is 96% which, calculated onto the previous values should be a reduction of a bit more than a rounding error. So with 8 to 12 hour workdays, you'll spend around 30% of your time at work.