Gaming is 2 hours, watching media is 3. That is manufacturer's, and in my experience with manufactured specs for battery life, it always comes in either on or below, never over. If it does, it is barely much.
But, did you heard that Quest 2 is wireless, and the PSVR2 has a wire?
Two totally irrelevant headsets to one another since neither can be used on either's platform with either's games?