5? We try for 5 anyway. We've all DM'ed so we all know the rules pretty well, except for grappling which we have to look up every time for some reason.

My style as a DM tends to emphasize exploration and combat over social, but we're also about to do a multi-session arc of nothing but social, so. Other ppl DM as well and have different strengths, and we generally try to play to the mood of the group