Pretty sure he meant round trip. Point was obvious to me, anyway. Lot more ULR time than rest time.
True and point made! But I think we have to blame all the extremely well payed company that study the circadian rhythm and of course they came out with a theory that makes the airlines save tons of money in logistics.
I personally think one of the major misunderstanding those circadian-rhythm-companies is to conducted multiple research studies try to maintain a roughly 24-hour periodicity despite the changing kinetics. But again I personally think for a ULR pilots the real cycle is 24+12. "24+12" is
one circadian day for a ULR pilot.
But the NTSB is constantly studying fatigue and now they have an other case to add to their study and statistic.