It's normal for it to take much longer. I don't know why but even at apple's site they warn it takes much longer. 10 mins sounds a little too long but I guess it depends on model/system. I've heard of someone else complaining the same thing.

I think in Tiger all you need to do is log out unless I misread it. But I'm not so sure about that. I've never tried it by just logging out.

BTW something else you could try is creating a new account on your mac & installing LW on it. See if that works. If yes, then it is probably something in your account that is causing LW problems. It's very easy to swap between accounts in Tiger & quite cute the way it goes about it.