This doesn't make me too hopeful about Kemo. I ruptured my achilles tendon on Thanksgiving in 2007 and was jogging and playing softball in April of '08 (with a bit of a limp).
Maybe his body weight changes the rehab time (although he has access to all kinds of trainers, doctors and equipment that you or I would never see) but it does not sound like things are going well for him.
Redskins Insider - Maake Kemoeatu's visit to Redskins isn't likely to yield a contract just yet