First post, first tourney win, and a question about rebuy strategy.

Hullo all, been lurking quite awhile here, just wanted to post a short note to say thanks for all the help! I've read loads of posts here, and between that and my own blind luck I managed to beat out a field of 120 in a little 5$ rebuy tournament Sunday.

Now for my strategy question: Is there a generally accepted line on the number of rebuy's a person should make in an unlimited rebuy tourney, before he just calls it quits?

Thanks!

-Matt