Dyne used to have 1 day added on to two people (2 new days in total) but not since the art changed because he now spends his time switching the art for the days. So to actually answer your question, YES! Only one day per update for one character.
Yeah, that's all I do right now. And really, despite the art, I've noticed that the amount of writing I've been doing is the same I'd do with the two routes combines, so... It's worked out pretty good for me lately.
