Ronin: Most players who do that have way to many games going for them to handle. So they play only a few every day, usually those that are closer to the deadline.
Seeing that you aggreed on the time limits when you started the game, you really should have no reason to complain.

Nowadays, whenever I create game invitations I set them to 2 or 3 days time per move, so that my opponent will move faster. Some "slower" players will avoid such games, while some others will prefer them to the slower games. Especially if you allow them to take vacation days, which is the default setting anyway. So you really have nothing to loose with trying different time settings.

P.S: try to stick to the board's language. You'll get more replies that way