Flamestrike
Legend
It takes a skilled party (or mindless foes) to have six separate encounters on a dungeon level, especially with the ability to take two one-hour breaks in-between. If the party screws up at all and their presence is noticed, the logical consequence is two encounters: the first encounter, and then a chaotic mass combat involving all the rest of the combatants (with fleeing/cowering non-combatants mixed in) of that level, plus possibly combatant reinforcements from other levels.
Rarely have I seen the entire dungeon level flock to the PCs for one giant encounter. Generally speaking its a group of 5 or so people, exploring rooms, and dealing with each room on a relatively individual basis.
That's been the basic premise of DnD since for ever.