Well, it's sort of a balance of both. You certainly don't want to put down that you only spend 1-2 hours on your main activity. However, if it's an event like Chemistry Olympiad, and you only study 1-2 hours a week but still make it to the national team, that would be pretty impressive. It's all about the impression that you create in the adcom's mind...they want to see dedication, and dedication (usually) is equivalent to time spent.
EDIT: that said, i doubt that a low number of hours in a certain activity would hinder your application. Just make sure that overall, your time outside of school is well-accounted for.
Last edited by asterstar; 12-18-2004 at 12:12 AM.