TarantinoFan: I have experienced what you were talking about. There are many players who use time and their days off purposely to aggravate everyone else. It is a strange tactic. I bought into this site to avoid that, but I still get players who (really) will use every vacation day they have rather than resign to a game that I have am one move away from winning. (In fact it is happening right now)
Anyway, Harassed is right to suggest that you choose games with the green dot or the red dot indicating no days off. I learned the hard way, like you. Once, though, I asked an opponent why they would not move, and let them know why I was frustrated, and they suddenly made moves every day and we finished our game in little time. It surprised me, but apparently direct communication can work.