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I just encountered the following error:

Oops! Your question couldn't be submitted because:

users with less than 125 reputation can only post questions every 20 minutes; try again later.

Why do you have this rule? Why 20 minutes?

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4 Answers

up vote 3 down vote accepted

To avoid spamming.

125 rep is not that hard to get.

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10  
Why do people always feel the need to respond to "Why do you need X rep to do Y" with "X rep isn't that hard to get"? That completely wasn't the question. To this day I don't think people should need 50 rep to comment, and it has nothing to do with whether or not 50 rep is hard to achieve –  Michael Mrozek Sep 23 '10 at 20:08
    
well i have more than 100 but it still shows?? –  Gautham Jan 4 at 5:13
    
@Gautham because the limit was increased to 125 since this answer was originally written. I have updated the answer to reflect the change. –  psubsee2003 Jan 28 at 12:52
    
@psubsee2003 oh thanx for the info. –  Gautham Jan 28 at 13:17
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Because of this:

http://blog.stackoverflow.com/2009/02/new-question-answer-rate-limits/

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Grace beat you to it –  Tobias Kienzler Sep 24 '10 at 8:36
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In addition to stop spammers, it is also a way to make you write better questions.

If you're churning out more than 1 question every 20 minutes, you're not putting much effort into the questions.

The more effort you put into a question, the better answers you get, and often effort equates to time spent composing it.

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Spammers.

Both intentional and unintentional (you would not believe how much time you can spend explaining to new users that they should edit their questions not re-post them every time they want to make a itsy-bitsey little change...).

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So true about new users. –  C. Ross Sep 23 '10 at 19:09
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Let's not forget about blog.stackoverflow.com/2009/02/new-question-answer-rate-limits –  Grace Note Sep 23 '10 at 19:12
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