KidSnide
Adventurer
We play for 4 or 5 hours every other week (in theory; it seems to end up being once every 3 to 4 weeks). There are usually three combat encounters each session, and the typical encounter takes 45 minutes to an hour or more to play out. So the immediately obvious issue is that 2/3 to 3/4 of each game session is consumed by combat encounters. True, I could run only one or two battles per game, but they need to be tougher (and thus probably longer) encounters or else the PCs daily resources are never tapped out. Also, my players like combat and find it exciting... for the first 15 minutes or so.
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I agree completely, on both counts. 10 to 15 minutes for a typical encounter sounds about right to me, with 30 minutes as an upper limit for an important set-piece battle. A very rare climactic encounter at the end of a long story arc could even take up to an hour.
I have a similar desire, but with very different numbers. My group plays for 3-4 hours roughly every other week. IME, a single combat takes up most of that session, so we only have combats every 4-5 sessions or so. I would love a system that let me run an encounter in 30 minutes or less. In contrast, I don't mind rare climatic encounters taking 3-5 hours, so long as those hours include a ton of interesting decisions and serious excitement.
-KS