Blocktime for Requests
Some people click requests immediately after they are handled.
Some tutors asked for a 'block time' like 5 minutes so students have to 'work' a bit before they can ask any more questions.
An idea for implementation would be to save requests with hostname, lecture, and blocktime in an extra database and for each request we check if an entry exists or not.
Problem here: We have to save the hostname with a request, i don't know if that's "problematic"...