I'm almost positive enemies don't respawn after you kill them. Like I said, I haven't had many encounters other than that one that i mentioned earlier, but I know the Cazadors and Radscorpions and Geckos haven't respawned, so I assume neither do the Deathclaws.
Enemies respawn, im positive. About 7 ingame days I belive.
On that note, could my game be bugged? Some of you mentioned 3 days but i haven't seen a single deathclaw respawn in Quarry Junction ever since i first wiped them out and that must have been 30+ gameplay hours ago.
If you kill the mother and alhfa male the deathclaws at quarry junction don't respawn