Not a duplicate! Here are the differences:
I already read the other question while researching prior to asking this, and it didn't answer my question. Come on, you gotta believe me!
The other question asks about what the most appropriate word to use in a restaurant setting is. This question asks about what the logically correct word to use in a particular sentence (Stack Exchange error message) is when the meaning is a mix of both.
The other question asks about ASKING FOR permission or ASKING IF something is possible. This question specifically mentions the use of "can" and "may" for GIVING PERMISSION or TELLING that something is possible. Questions and statements are not the same kind of sentence.
I always have to fight to stop my questions from getting closed as duplicates. It's so irritating! Give me a break!
Stack Exchange has a network-wide restriction that limits low-rep users to only ask 1 question per 40 minutes (90 minutes on Stack Overflow).
The error message that you get when you try to ask too many questions:
You can only post once every 40 minutes.
"Can" is supposed to be used to denote the possibility of doing something, i.e being able to post once every 40 minutes.
On the other hand, "may" us supposed to be used to ask for and give permission, i.e having permission to post once every 40 minutes.
The error message in question seems like a hybrid of the 2 "can" and "may" contexts. The system gives users permission to post once every 40 minutes, but it's also impossible to post before the 40 minutes is up.
Which is the correct word to use here? "Can" or "may"?