Just by the mere fact that these are constants documented to be in seconds, it's clear that they shouldn't be used for sensitive or precise time calculations.

Just by the mere fact that these are constants documented to be in seconds, it's clear that they shouldn't be used for sensitive or precise time calculations. If you're at the point where you don't realize this, you probably aren't going to be able to use a full-featured time library correctly, either. "Difficult for novices to use incorrectly" is a good feature for code to have, but it's not the highest good, and its absence does not mean that the code is bad.