My 80+ father can easily drive 16 hours a day. It's pretty damn amazing. It must be a military thing since he only gets around 5 hours a sleep at night. I tried to beat his record time to Kansas when I was 25 and I couldn't do it. He can still drive rings around me driving time wise.
You yourself that it is AMAZING. He is an anomaly, not the norm.
You yourself admit that it is AMAZING. He is an anomaly, not the norm.