I see now.
Would a shortage of 2~4 hours change the relation of Spawns to Tree-Mons so significally it would disrupt the whole system, though?
If you're interested in a fair and balanced game, I highly suggest you to consider my request.
The way as it is now, I eventually won't even have the chanche to ecounter a rare tree pokemon, even though I'm online every day, around the same time.
I doubt this small shortage will do any damage. If you'd make a 12 or 18h cycle, yes, but not 20-22h.
I'm not trying to be a smartbutt, just wanna make a point here.
(Also I remember Pokemon Global Link had the 24h cooldown for Dream World, and later shortened it for about 5h if I'm not mistaken, because of just this problem. That's why I even come up with it)