(Psi)SeveredHead said:
Unless the DM throws multiple encounters at the PCs, one right after the other, in the space of an hour.
Happens all of the time in "dungeon" settings (i.e. RtToEE, Sunless Citadel, Forge of Fury, etc.).
But yes, in City and Wilderness encounters (especially Wilderness ones), it would have less utility.