Blake's didn't require full repair at OU, much different recovery. It's more like when Blake had to have surgery before the Olympics last year and they told him 6 to 8 weeks.
Now Russ is probably the toughest SOB (along with Kobe) in the league so I don't count him out, but it may be awhile, if at all, before he gets medically cleared. Besides, they might be eliminated in a couple weeks now.
Edit: they are SAYING RW will need full repair, but I've heard of instances when they get in there that's not the case, but the MRI is usually pretty conclusive