It's 7.5 min respawn.
Just north of the wolf room in hall, is 6 wolves, 3 pairs of 2, that, at least on my server, are never camped, with 1 roaming giant in that hall.
I keep it cleared with 4 mag, 1 pal, 1 cler, with just enough downtime to keep up mana.
Alternatively, there is a tiny room...