The most important thing is not to give a lot of notice when you quit, or to give a crap about how much notice you give them at all. It's when. If at all possible, you should give notice at or slightly beyond the first of the month. That way, when you leave, you will most likely retain your benefits through the rest of the month.
If your last day is say, the 28th, and you don't start a new job til the 2nd, then you're gonna be without benefits for the entire month.
If your last day is say, the 28th, and you don't start a new job til the 2nd, then you're gonna be without benefits for the entire month.