the consensus from what i gather seems to be every day. on training
days, half a dose pre workout, half postworkout. and whenever is
convenient on rest days, to keep your creatine levels topped off and aid
in muscle recovery. i totally just spit that back out from shit i read on
another message board.
what Taku said however worth highlighting that the faster response is only in the first few days of taking it. Once you are on it, taking piles of the stuff will not make any difference.
Also, from what I have read, you can skip your dose on non-work days as the level in your body drops quite slowly and as your absorbtion potential increases after excercise to about 130% of normal, any that you take on your off days would just be a waste of money. For the same reason, you should take it after excercise not before.