How long is a mixed protien drink good???????

I need to know how long after you mix up a protien drink is it good. I know protien will start to break down, but how long???? I usually mix a dink up 8oz and sip it down, usually will take me an hour (I am pre-op) I plan to only mix up 4oz after surgery...but want to know....how long do I have to get it down with out loosing any of its protien value??????

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