As far as i can see theres no limit on the level cap. But it may be possible to just reach 100 in all stats get all perks and lower all sens eventually so in that sense there may be a cap.
well im not really sure how long it would take from 0 to 200. But i did lose my save a once like a while back and i managed to get to 100 in like 2-3 hours probably.
