I am pretty new here thus sorry if my question is a bit stupid. This is related but I am asking for kind of the "opposite".
I mean, one can struggle to solve a puzzle and ask for an hint. But if it is done in the comment, it can ruin the pleasure for the other users to solve a hard problem. Also, I guess that timing is important : it seems useless to ask for help from OP twenty minutes after he asked his question. Hence my question:
When is it acceptable (if it is) to ask for a hint on a puzzle?