INSANITY | Month2 Tmrw | Protein Question

I start month two of INSANITY tmrw. Its two workouts in one day;
w/ the work schedule I have, I have to do both workouts within a short time period;
( probably about a 30min rest in between ) so I have a question . . .
would it be a good idea to drink a protein shake during my break & workout again?
or should I just wait till both the Fit Test & Max Interval Circuit are complete?
I workout first thing in the morning before I eat anything if that makes a difference.

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