It's always been 3 minutes, I remember it very clearly from camping Raster with my monk. The PH despawns at 8am game time and respawns at 10am (or something like that) The spawn was on a 29 minute timer, so by killing the PH at 10am, then again when it respawned at 8-9pm, you could let the next spawn despawn if it wasn't raster, then respawn for 3 chances at him per 72 minute EQ Day
