Mark Hope
Hero
Typically 2-3 per session.
We're playing 3.5/Pathfinder and normally game for 5-6 hours a session. Games are RP focussed and tend to involve a few bigger climatic battles rather than many smaller encounters.
This.
(Specifically this, in fact, on account of us being in the same group

When a combat-heavy session comes around, it rises to about 4 or 5, but those are rare and require some pretty break-neck pacing.