I've run/played in everything from three lance v three lance (ie. 6 total figures on the board) BattleForce to more than a hundred figures per side Quick-Strike.
I prefer quick games in general though, I so I like company v company size Quick-Strike games (12 figures a side) or possibly twice that for BattleForce (6 figures a side). I would say that's close to a TW lance v lance battle. One interesting part of Quick Strike is that things can scale up pretty large without increasing time all that much, since movement/range isn't as complicated as Total Warfare.