The pic on record probably logs entire flight as P1
his fo would log actual time in seat. Say six hours of a 12 hour flight
the relief Capt/fo log half of flight minus 1.5 hours so only 4.5 hours( if I understand correctly? To be honest none of it makes since)
have heard of people being rostered for up to 150 hours a month using this formula and just don’t think that should be allowed