when you come across it you'll know...
10 a king can only make one of two moves; a trade is in the works - 2) i take your queen you need to take my queen back but instead i wait 3 days and another 3 days for followup move.
my thought is that the site should monitor abuse here as in other areas like aborting a live game for some reason..
many comments have been made by many people to move someone along with abuse of 100 games on wait ... at what point is someone abusing - fair play policy - again one or two users out of 250,000 should be warned in my opinion about courtesy and fair play.
You can check a players profile and get their average time per move. Should help give you an idea if they are slow players before you get into a game with them.