For eyes? I am sure more than 1 hour and you would be having issues if you are over 30. I am sure young ones can handle a bit longer. Not sure about how safe psychologically using the VR headset and staying in metaverse games. For now everything looks within safe limits.
I think at current rate the best we can get is spec size. But in near future who knows there could be lens. or even a simple trigger near ears that could turn on or off to login to metaverse.
NFTs, metaverse are going to be a norm soon. You'd see how the top gamers move to it and then will take crowd with them. We have no option than to adopt the new micro transaction and the NFT, metaverse world.
I follow this guide for services when it comes to handling resources and configs.
https://www.blackviper.com/service-configurations/black-vipers-windows-10-service-configurations/
I think just like how linux can be used on the old PC. I think raspberry pi devices would bring back the retro games so there is less need to use the emulators.
My experience so far has been good. Maybe I am not pushing windows too bad and limited use apart from office and the games is less so not much bad experience.