Usually evenings...late afternoon thru the evening. With the exception of if you work out in the morning and you are trying gain, after your recovery drink your next meal should consist of protein/fats/fiber...no impact on blood sugars and will help restore insulin sensitivity. If you are trying to lose, your recovery drink itself will consist of protein/fats/fiber....no impact on blood sugars, so will keep any fat burning you achieved through your workout intact. Fit your amounts for the day into your macro scheme.
-------------- If you don't stand for something, you will fall for anything....