Depends on too many factors to list - so anywhere from 10 to 40+
This.
There's no way to even come to a general average.
Are we playing 1st level characters? 5th? 15th? Some demi-god level "tournament" kind of game where XP and leveling aren't really an issue, but we're just playing through a given scenario or single great battle/war?
Do they find all of the treasure, some of it, miss it completely? Get the sack of copper pieces off the ogre but miss the huge bejeweled golden sceptre in the secret "real" treasure room? Are we including Magic Items as additional XP or simple "treasure/gp worth" XP?
Do they defeat all/some/none of the monsters? I grant XP for "defeating" creatures, not necessarily "killing" them...at least partial, if not whole. At low levels in particular, bypassing a monster, parlaying/making deals and/or stealing their treasure without putting the party's well-being in jeopardy gets you nearly complete "monster" XP.
Are they going up against a hive of kobolds or a single demon lord? As characters of any level can potentially encounter either or anything in between in my games.
Are we playing a 2 hour session? 5 hour session? All day/overnight/weekend marathons? Seems the longer one can play straight through, the more creative players get, the more interesting "in character" stuff happens (which might also land you additional XP), the more the XP tends to accumulate more rapidly. So it could be a level in a single [moderately] long session...but could take any multiplier longer, if playing in shorter sessions, to accumulate the same amount of XP.
So...yeah. Not really a question/poll that can be given a "straight" answer....so naturally I put 40+.
