I think 2-5 days is ok. If you wait too long then she'll wonder what happened to you and just give up. If, however, you say that you are going to call at a certain time / day, please make sure you. I'm w/ Fonz, dating totally sucks and it is a complete mind game, but I personally think you are best off just being yourself. If you start acting like you are playing the game, then either you will get sick of it or she will.
The only thing I've ever asked of anyone I am interested in getting to know is that they respect me at least as a friend -- if you say you are going to call, do it. Don't fuckin lie to me and waste my time. That's a guarantee that I won't respect you as a friend and will be pretty sure you are just full of shit and have no integrity. If you aren't interested anymore, then that's fine, but be straight up about it. I respect that in people.