I don't really get dizzy or disoriented unless it's a game where you move with the joystick control or something. Games where you move around a table or teleport from place to place haven't bothered me at all.
I get motion sick easily. So I was worried about that but most popular games are designed in a way that there is no movement that would cause me motion sickness. Also they list games’ comfort levels and I avoid anything that is intense.
The biggest issue for me is videos where there is no rating and one slow camera pan or zoom will make me almost throw up.
I can use it for 2 hours or more. The only games where I get dizzy within 15 minutes are the roller coaster and driving games that spin you upside down where it feels like you have no control over movement.