I wrote a comment following an answer. A few minutes later, I see a horrible typo. So I edit my comment, click "Save Edits" but get a little red pop-up box saying "Comments may only be edited for 5 minutes". Why can't I save my correction? What does five minutes have to do with anything?
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2$\begingroup$ This FAQ posts contains many details about comments: How do comments work? You might be interested in the section Who can edit comments? Specifically, this describes your situations: "Users may edit their own comments any number of times for five minutes after they are first posted." $\endgroup$– Martin SleziakJun 1, 2018 at 6:04
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$\begingroup$ A related older post on this meta: Why can I not edit a comment after 5 minutes but can just replace it? Other posts linked there are about the same topic. $\endgroup$– Martin SleziakJun 1, 2018 at 6:06
1 Answer
Comments are second-class citizens on the StackExchange network.
As such, they are only allowed to be edited in a short five minutes window. If your edit was submitted outside this window, you will see this red error message.
What can you do? If this is a fresh new comment, delete the old one and post a correct version. If the conversation already rolled onward and your comment received replies, it's best to leave a clarification.