First of all, it is clear: yes! The use time of protein powder is unlimited, because it is food at any time; But the effect is definitely different at different times. If it is ordinary fitness, there is no time. If it is high strength, it is suggested that it should be better within one hour after exercise, because the muscle fiber injury is in the process of recovery and reconstruction, and the absorption rate of protein will be high and the effect will be more ideal! If you have any questions, you can also discuss them with me. I'd like to give some advice.