Hmm, I guess it depends on how quickly you want to wean.
I wouldn't recommend going cold turkey, it won't be good for your boobs for starters
I think the usual recommendation is to drop a feed per week, but if you're wanting to do it in a hurry maybe once every few days?
Sorry I can't be of much more help, hopefully one of the b'feeding guru's will be in soon to help you out!