Originally Posted by Jjangthekid
15-20 minutes or so.
Sounds like what I have.
Never play Dead Space then, especially when you spin around fast, god that is sickening!
Though I found that if I did it a bit, and started getting a little nauseas, I go do something else for a while (hours, or a day) and come back, that my body had sort of gotten a resistance to it. I occasionally still have issues with it if I haven't gamed in a long while, but doing the above once is enough to get me back "immune" to it.
I had this issue with every FPS I played till Turok 2; and I did the "get a little sick, take break, repeat", and eventually built up a bit of an immunity to it.
Also, this is kind of stupid, but make sure you drink some regular water before you game, getting a little "dried out" can increase your chances of nausea significantly.