When I first started VR I would get sick, so I started to use it for 30 minutes at a time, then 1 hour, then more and more until I can handle 8 hours at a time (break at 4 hour mark). It just takes practice.
Did this with a car once. It was a controlled enviroment, had one guy on an e-bike with the camera at the top of a poll and then I drove around the track with the headset on. Probably would've worked better if we'd gotten the tires aligned beforehand but it did work.