[agscala]

Why not have "time to submit" points work as follows:

The problem details aren't shown, only a brief description. User clicks a button "accept challenge", is given problem details, and the server starts recording time until a solution is submitted. Base points on that time difference.

Sure, there are loopholes (such as someone else posting the question on another website so you can create a solution before accepting the challenge). I think it's better than checking for new problems and get lucky by noticing a new challenge came out very recently and there are no submissions.