How does the flagging feature work? I can flag a few posts, but after that I just get 'limit reached'. I get that you need to prevent abuse, but there's no feed

How does the flagging feature work? I can flag a few posts, but after that I just get 'limit reached'. I get that you need to prevent abuse, but there's no feedback on when that limit is lifted, or whether I can avoid triggering it, etc. Something as simple as a first-time dialog saying 'you get three flags per day - still want to use this one?' would be handy.