This guy seems to be one of the spawns that wanders the TOV valley.
As far as time kills:
4:34 Onava
5:48 Kar Sapara
5:54 Honvar
10:44 Gangel
11:17 Mav Sapara.
Which means it is not 8 or 9 hours as previously mentioned. This was one of my last so, once I was done I left. Hope it helps.
I recommend setting up in the valley by the entrance and the mobs will march to you. Just my 2 coppers.