I have been practicing problems on various sites such as UVA, Spoj, Codeforces and codechef. However, my issue is that I am never able to get more than 10 problems done in a day. It usually takes me an hour to understand the problem, and then understand the concept it involves, before actually getting down to writing the actual code.

Is this normal? How many problems do you all do per day? I just wanted to check, just to be sure that I am on track or I need to improve.

Please don't downvote, this is a legitimate question.