An 8 hour flight is a normal intercontinental flight, not even particularly long (London - New York/Delhi/Nairobi/Dubai sort of distance). Longer flights like London-LA/Singapore/Joburg/Tokyo are perfectly normal, or reasonable.
I would rarely do 8 hours driving in a single day, let alone 12. Certainly couldn't do that for work, would be massively against policy.
I would rarely do 8 hours driving in a single day, let alone 12. Certainly couldn't do that for work, would be massively against policy.