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Agreed Backoff ... I actually find it daunting when my opponent moves straight away, particularly in 1 day games (one reason why I no longer play them). I tend to play for maybe an hour about the same time each day, if I am early one day, opponent moves and late the next then I have a time out ... now I was hardly tardy.
So I would suggest that a person's time period be two times the stated time frame ... let's go through an example. A two day game ... A moves, B immediately moves (even though they actually have 2 days to make the move) ... now A still has 4 days to make their next move (the two days B could have taken and the two days following that for A to make their move). Vacation days get added, irrespective of whether either party moves during that time (this should answer Caissus' valid problem that he might get timed out on a game that he was expecting to be extended (because the oopponent was on vacation)and wasn't (because they moved). Now I can hear many voices crying "oh no" games will take even longer, but the reality is that they won't, what was a two day game can become a one day game (two days for A to move again), four two and so forth. What it does do is set some certainty for the likes of me as to absolutely when I must move in a game irrespective of an opponents' speed of moving. And, of course, the same principle could be appled to games which might run in hours rather than days.