How long are protein drinks stable - the protein of use to us?

I found out that I can mix my protein extra concentrated and use it in my coffee (yes, I know I shouldn't drink coffee, but it's one of my few remaining joys - although this diminishes that joy.) Can I mix up enough for a week are at least several day? THanks for your response - oh yes, if this posts twice - its because I asked the same question 5 hours ago but it hasn't cleared so don't know if it was lost in the never never land of the internet. THanks -

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