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I created this question, got an answer, commented one time (comment #1), edited that comment twice, then added a new different comment (comment #2), deleted comment #2, and then could no longer edit comment #1. Why?

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I can't reproduce this at all. Comment 1 must have just fallen out of the grace period for editing. –  Tim Post Aug 12 '10 at 15:56

3 Answers 3

up vote 8 down vote accepted

You only get a five-minute window to edit comments. See Should we be allowed to edit comments?.

There is no actual limit on the number of edits per se. I've edited my comments as many as four or five times to try to get the formatting right.

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Aren't comment edits rate limited? Everything else is, I'd be surprised to find out that they aren't. If they are, that, plus the 5 minute window, would put an upper bound on the number of possible edits....and after a bit of experimenting, it turns out that they are...so you can only make 60 edits, 300s/5s/edit = 60 edits. –  tvanfosson Aug 12 '10 at 15:19
    
@tvanfosson: I don't think so. But I'm going to try it out. Three edits in 30 seconds ought to do it, maybe? Or six in 45 seconds? Nope, apparently not. –  mmyers Aug 12 '10 at 15:21
    
@mmyers - I got rate limited. The message indicated a 5 second window per edit. –  tvanfosson Aug 12 '10 at 15:27
    
@tvanfosson: Is it 5 seconds per edit or (total edits / 5 seconds)? I.e., if you wait for a minute and then start editing feverishly, does it limit you? (I can't even get the edit window to open and close in five seconds.) –  mmyers Aug 12 '10 at 15:31
    
@mmyers -- appears to be 5/sec per edit. The message is "You may only edit a comment every 5 seconds" -- I did a series of edit/save/edit/save without actually making changes until I got the warning. –  tvanfosson Aug 12 '10 at 15:33
    
@tvanfosson: Still can't reproduce it. Perhaps that rate limit does not apply to moderators? I know the comment upvoting limits still apply, but the comment deleting limits don't. –  mmyers Aug 12 '10 at 15:38
    
@mmyers - I wish I was special. :-( –  tvanfosson Aug 12 '10 at 15:43
    
@tvanfosson: Can you try it again? Tim Post couldn't reproduce it, and he's not a moderator on this site. –  mmyers Aug 12 '10 at 16:00
    
@mmyers - sure, I'll screen capture this time: see tinypic.com/r/otl0js/4 –  tvanfosson Aug 12 '10 at 16:01

You can always use the copy/delete/paste (& edit) method to update a comment, even outside the 5 minute edit window.

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2  
Although it is a little awkward when someone's responded in the meantime. –  mmyers Aug 12 '10 at 15:20
    
@mmyers - true, but sometimes fixing that glaring spelling error that makes you look like an idiot is worth it. –  tvanfosson Aug 12 '10 at 15:28

The ability to edit comments is on a timer. You can only edit your comments within a five minute time frame. Five minutes give you enough time to fix those "oops, I made a typo" moments. But it makes it less likely that people will change the content their comments after the fact.

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