And you have used hours of training on a thing used once every blue moon. Congratulations, I guess? Generally something is worth optimizing it this much when

And you have used hours of training on a thing used once every blue moon. Congratulations, I guess? Generally something is worth optimizing it this much when you're going to use it more than 10 times. Insert obligatory xkcd chart here: https://xkcd.com/1205/ https://xkcd.com/1205/ There are things that are this useful, but they're generally in category of mathematics, potentially physics, chemistry or linguistics. Learning parameters of a shell command, especially all of them, is a waste. Learn useful things first. This is the main problem SuperMemo and Anki sets face, the ordering is by difficulty only and not by product of difficulty times usefulness.