Not only is his arm coming apart, but his face looks like it came right off the coroner's table.  I'm kind of terrified by him now.

He hungers for brains and catching some sweet rays.

The timetable below outlines the process of an infected human (give or take several hours, depending on the individual).

Hour 1: Pain and discoloration (brown-purple) of the infected area. Immediate clotting of the wound (provided the infection came from a wound).

Hour 5: Fever (99-103 degrees F), chills, slight dementia, vomiting, acute pain in the joints.

Hour 8: Numbing of extremities and infected area, increased fever (103-106 degrees F), increased dementia, loss of muscular coordination.

Hour 11: Paralysis in the lower body, overall numbness, slowed heart rate.

Hour 16: Coma.

Hour 20: Heart stoppage. Zero brain activity.

Hour 23: Reanimation.

I'd say he's around hour 20.