Comment by joestrong

A slightly related thing I think about someone's, is if I look at the time and it's 13:05 and then I do a task and when I finish a task it's 13:10, you could say that took 5 minutes, but because we can't see the seconds each time could be up to a minute out. So a total of 2 minutes error! Quite big if you're timing something small like 5 minutes!