it took my party about 2 hours at most to kill 60 terracotta warriors (a fairly tough fight). and thats about average for a big battle involving lots of NPC's.
as has been stated above that combat should have gone by fairly quickly.
round 1: spell casters bombard the high level NPC's. Front line combants lay into the lower level shumcks, decimating most of them (isnt great cleave wonderful). supporting combatants mop up those who are left
round 2: spell casters bombard the high level NPC's again, most likely killing the wizard (and maybe killing the cleric, though i doubt it) Front line combatants move in and mop up who ever is left.
as has been stated above that combat should have gone by fairly quickly.
round 1: spell casters bombard the high level NPC's. Front line combants lay into the lower level shumcks, decimating most of them (isnt great cleave wonderful). supporting combatants mop up those who are left
round 2: spell casters bombard the high level NPC's again, most likely killing the wizard (and maybe killing the cleric, though i doubt it) Front line combatants move in and mop up who ever is left.