I think Larry's idea of day to night cycles would bring about a slight remedy to the scale issues of larger scenarios with hundreds of turns. Resupply is one of the biggest issues.
Fatigue also needs to be considered. It might be a programming nightmare to have some units fatigued while others are not, simply because some are fresh, or not involved in combat, while others are continuously in combat.
I would have no problems "of scale" in a scenario using three Corps of troops per side, on a 400 by 400 map, if the designer had a 25 turn limit, and set victory levels accordingly. My "problem" arises when the scenario designer uses 300 turns because so many units are on such a large map. ;)
I believe the 15 to 20 turns as a "day's fighting" makes some sense. Maybe even stretching to 25 turns on longer maps where reinforcements enter later than the first five turns?
It's all a matter of the intent of the original game designer/developers, using the limitations of the game system, to create "realistic" scenarios? :chin:
Placing in a system for extended combat would make the game more flexible. But, is it worth the programming effort?
HSL