a) Spending
time calculating a value with way more significant figures than akcually required, b) Calculating something that shouldn't be calculated, e.g.
time "wasted" whilst you're reprimanded by
parents for your trivial wrong-doings when you ought to have that time to catch up latest YouTube videos
I
spent an hour over-calculating how much
time I'd
lose getting yelled at for missing curfew, when I could've just been watching my favorite YouTube videos instead!