IronWolf
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On the issue of time.
I've done this before, in another thread, but I'll do it again here. You cannot possibly increase the pace of your groups that time will actually make any real difference over the long run. To go from 1st to 20th level in 3e takes about 260 encounters (give or take). So, the Slow Group, doing 1 encounter/day takes 260 days. The fast group, doing 4 encounters per day, takes 65 days.
The difference, and this is the absolute maximum difference you can get is about 6 months from levels 1 to 20. And the actual difference is going to be a hell of a lot less because the Slow Group dies a whole lot less than the fast group, meaning that it's not losing levels to Raise Dead and the like.
Your campaign world, unless you're running D&D 24 will not change that much in that amount of time. Heck, even going back to Keep on the Borderlands, it takes WEEKS for a cleared out cave to come back to even half population. Spending an extra four or five days clearing a cave? Makes zero difference.
This seems really out of left field to me and seems to indicate you aren't really listening to those of us without 15MAD issues in our games. There are still passages of time in our campaigns - some with encounters some without. I am not sure how you made the leap to needing 4 or 5 encounters every single day of campaign time?
I know in my campaigns we have massive movements of time. My current campaign has many years of time having passed during the course of it.
So I am not really sure where you were going with this the numbers you present are so far off in how actual play works I feel like I must have missed something?