This is a very interesting question and I've been searching for info for the past couple of days.
I've found nothing!
I too mix my protein powders with water, but only keep a day's worth in the frig at a time.
I would GUESS that 3 days SHOULD be just fine for whey isolates since they contain undetectable levels of bacterial pathogens. With that said, it might make sense to think that the shelf life (or frig life) would be that of whatever you use to mix it.
Sorry for not providing a definitive answer...
My 2 cents...



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