Our group plays, Shako 2.
A decent sized game 20 or so battalions a side with cavalry and artillery will play out in 3 hours or so.
Our big battles, 100+ battalions aside or more will take the better part of a day.
We have 3 stands with 4 figures each for Battalions, 3 stands of 2 figures each for cavalry and 2 guns per battery.
They have good flavour of the period and there are a number of scenarios available for Shako.