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Grow! Whey in Peanut Butter

Hey…I have mixed some Grow! Whey into peanut butter as a homemade power butter type deal. Anyone know how long I can keep this in the jar? I know you should drink protein shakes within the day you mix them…is that the same for the peanut butter whey mix?

I Also do that with ON Whey but I just do a scoop at a time with a tebelspoon of Natural Peanut butter! I dont think you should leave it for beyond the day. However if its in the fridge it might be ok?