A while ago I heard from a (maybe unreliable) source saying that 50g could typically be taken in per sitting 6x day, I'm unsure what the time is that would take and its certainly dependant on how slow the protein is asbsorbed.
Just eat your bodyweight, like nathan said, and you'll be fine. If you eat more and stay within your goals I don't see it being a problem. I probably eat about 300g of protein a day just because I love meat.. :x