I don't think it's high maintenance or lame or anything like that. Of course you can get through the weekend, but it bothers you. The only thing wrong with that is that it's unpleasant for you.

But I do wonder about emailing on a Saturday when you know you can't expect a real answer until Wednesday. If you were fine with that it would be no big deal, but it seems like you're testing him a little to see if he'll answer sooner and setting yourself up to be frustrated if he doesn't.