Gentlemen,

I apologize if this is seems to be stupid question or has been asked previously. I searched on this site and throughout the web, but couldn't get my hands on a solid answer.

Basically, my question is this: Is there a time limit for protein powder and dextrose to be in water before it starts to degrade and lose its effectiveness?

I live roughly a half hour away from the gym and was wondering if i could make a shake of 48g ON whey, and 80g dextrose before i leave, store it in my car, and drink when my workout is over. The shake would be in the bottle for roughly an hour and a half. Any help is appreciated.

DG.