I've played a lot of VR games but they were games with a beginning, middle and end. So in that regard you can't really put more time into them than the duration of the game. They were good games, though (for my preferences). Shout out to TO THE TOP for lasting me a very long 15 hours of arm pumping motions (and I didn't 100% it!) Room-scale VR is of course restricted by the user's physical condition, so you can't just marathon a 15 hour game.

The only uncapped VR experiences I've tried so far were Beat Saber, Rec Room and VR Chat. At the time of writing I'm at 99 hours of Beat Saber.