I got an answer to a question very shortly after posting it on StackOverFlow, and went to accept it, but got a message along the lines of "you can't accept this question for 4 minutes".
I tried again approx 4 minutes later, and got a message something like 'You can accept this answer momentarily'.
Not to be a pedant, but 'momentarily' means 'for a moment' not 'in a moment', so saying you can accept the answer momentarily is incorrect - it should really say something like 'You can accept this answer in a moment'.