That assumption allows you to respond to their move immediately, thus letting you build up a time bank with several moves in succession. Worst case scenario is that your opponent waits for you to go and do something else, which could be 10 minutes, an hour, or maybe even a few hours. It’s not a bad point to make, but the assumption that your opponent responds immediately without you building up any sort of a buffer is too strict.
Besides, I think saxmaam is accounting for a bigger time bank to begin with.
If you start with two weeks of time (336 hours), playing one move a day will get you 224 hours to use for the next week and 112 for the week after that. In other words, you will get 3 full weeks of one move per day. That’s only 21 moves, so pace has to be considerably quicker to keep the game going much longer.
If you play two moves a day, you get 280 hours at the start of week 2, 224 at week 3, 168 at week 4, 112 at week 5, and finally 56 at week 6. That’s 6 full weeks of 2 moves per day. That’s a total of 84 moves per player. That’s not bad.
Of course, those are using the assumption that your opponent can respond instantaneously without you providing a few responses of your own in quick succession to build up your time bank. If player X is always available, then player Y will likely be able to dedicate an hour for one day per week to knock off, say, 14 moves which matches the pace established above. If player X isn’t available to have such a session, I think it’s reasonable to assume that player X isn’t likely to be the type of player to respond in such a way that player Y loses time at a significantly faster rate. In other words, either player Y needs to build up time and is able to do so with a single hour per week (averaging less than 10 minutes per day), or there’s no pressing need to build up time.
I don’t know what kind of time frame we’re trying to achieve for completion of these ladder games, but I think a smaller increment can work with the right starting amount.
The reason that I would oppose 8 hours is that we usually have multiple games going on at once. A slower pace allows one to better handle the multiple concurrent games that occur during tournaments and various ladder challenges. That’s why my preference is 16 hours.
I’d also like to see a strict limit to the number of challenges one can play simultaneously in a single ladder to let people focus on fewer games with better pacing. An extra benefit is that this would motivate more people to challenge #2 almost as much as #1. (Is there already a limit on number of challenges? If so, make it smaller!)