theres no real limit.. i mean, you'd be stupid to eat 400g protien at your weight.. stop worrying about how much protien you'll waste.. find your total energy needs, pick a macro split, and follow it..
i eat up to 80g protien per sitting at times.. i dont believe u need to eat that much..
there are guys that say your body cant take in more then 40g protein at a time.. i say bullshit..
so just make a macro split
for example.. if you wanted to do a 40/40/20 split at 3000 calories it would look like this
300g protein 40%
300g carbs 40%
66g fats 20%