Actually, I was riding the bike at 4 weeks as I was comfortable enough, and felt I could handle emergency situations again

. This, with a couple of partially healed fractured ribs (which could not be stabilized - 1st and 2nd). 6 weeks was when I rode back to the accident site, 200 km out of town, over broken roads part of the way.
As the fracture is pin stabilized, there will be very little pain once the swelling subsides, and the rigid fixation will speed up healing, too. You've just got to cross your fingers, toes, and whatever else and hope that there are no serious ligament injuries.
Your friend should be on the saddle sooner than he thinks.