Earlier quoted context omitted.
Not sure if the two of you are disagreeing or not, so genuinely asking: Could it be that you are both right? As in, you should stop right away when you start getting motion sick, but with time it will get better? Something like: play 15 minutes everyday, stop as soon as you are sick, and after a while you will be able to play 30min, etc. I have no idea, just asking for a friend :-).
This is interesting for me to, but I'd be surprised to learn someone actually has an authoritative answer.
You know, just to see that it has happened to someone :-)