You can only ask 50 questions in a 30-day period
35209
50 questions / 30 days limit with only 2 questions posted
127896
When to ask multiple questions in a single post ? (Revisited)
56691
Disallow closing of questions with a certain number of question / answer upvotes
75635
Why can I only change my Stack Overflow name once every 30 days?
5746
Disallow deletion of questions for 24 hours after last answer was posted
106952
"Please ask a new question" encourages question repetition for duplicates
32429
Tell rate-limited users how long they have to wait before asking a new question
101833
An "urgent" tag for questions that need answers within minutes
10721
"Requires 50 reputation" to comment on deleted posts
97789
A Flag to close Questions from ongoing Contest
51389
You earned -30 reputation today
71023
"You can only post once every 40 minutes" on different sites
32846
Allow people to answer protected questions if they have earned at least some amount of combined SE rep
96392
Comment on a question without 50 reputation points
120381
Why are we allowed to ask only one question per 40 minutes?
51954
"You can only post once every 40 minutes" on my first post
32836
How about a difficulty rating for questions?