Well, I once spent about, oh, 6 hours writing and rewriting a solution and kept on getting the same wrong answer. Turned out I hadn't trimmed the input properly

Well, I once spent about, oh, 6 hours writing and rewriting a solution and kept on getting the same wrong answer. Turned out I hadn't trimmed the input properly. Hey ho. But, I'm slow, and I try to do it TDDish in a language I'm not so familiar with so there's that. This year my aim is to finish all the problems by Nov 30th 2019 :) Even when I try go _as fast as I can_ (in ruby) I've only ever managed about 120th on the leaderboard. Now I just aim to have fun and learn as much as I can. But to answer your actual question, if they're easy, within half an hour or less, hard ones, anywhere up to 5 or 6 hours (I'm slow, I'm OK with that :)