Auto comment: topic has been updated by dtc03012 (previous revision, new revision, compare).

That's a surprising question coming from a purple coder. I mean, is the question "how much time do you spend on a unique problem?" and well, it would depends greatly. On a A difficulty from codeforces Div 2, less than 3 min, on a difficult problem during a contest, sometimes more than 1 hour without solving it.

Theses answers aren't very interesting, and you can find it by yourself on leaderboard.

If you ask about "how much time do you practice per day / week / month ...", I would be curious to know also. Personally, I would say between 0 and 10 hours per week, depending on my spikes interests.

But I would say quality is way more important than quantity. Instead of solving all the easiests problems in every competitive programming websites in the world or training only by taking participation in contests (I "kinda do" both pathetically) and taking hours and hours for it, it's better to find the limit of your comfort zone and pushing it further everytime, by oscillations between upper area of comfort zone and lower area of discomfort.

Auto comment: topic has been updated by dtc03012 (previous revision, new revision, compare).

a lot and still not enough :C

Can't you just practice as much as you want? Obviously, the more the better (unless you're hitting maybe 60+ hours a week).

If you really want some number, here you go. 15 hours a week is a good amount if you're in school and have enough time.