Suggestion: Limit the number of submissions for the challenge problem

Due to the nature of the challenge problem, many coders submit the same code a LOT of times

This not only overloads the test server, but also reduces the response time for other users drastically.

Suggestions (For the long contest):

1. Fix a limit on the total number of submissions OR

2. Keep a minimum time between two consecutive submissions (2-5 minutes) of an user.

I personally favour the second option. What is your opinion?