seriously... it's diffrent for every person in every relationship. There's no way you can put a time frame on it that will apply to everyone.
cry a few times... yadda yadda yadda... then fuggaboutit
the sooner you realize how small and petty and completely and utterly insigificant your relationship with him was... you'll be done with it. Look at the big picture, the sun will come up, snow will fall, planets still spin, comets still do their thing... fat kids will still love cake. See... your feeling better already.