I can play like this for an hour or so
Get a multi elevation desk (around 20 bucks from office depot) it allows you to lower and tilt the TV UP toward you reducing neck strain
adding cheap armrest bars/aerobars (also around 20 bucks on Amazon) allows you to rest your elbows comfortably while riding the bike, keeping your weight forward.
Tips
Games that require alot of concentration will naturally make you slow down. Going faster (higher heart rate) tends to increase the games difficulty.
Sweat will be a pain with the controller so keep a towel handy.
My Trainer is rather loud, so I use (in the ear) - ear buds. I originally used a cloth - full headset, but the sweat made them stank up.
