logging hours on a ultra long haul flight with 2 sets of crew

[captzebra]

how pilots divide flying hours on a ultra long range flights.
for eg if the flight time is 18 hours how much each pilot put it in his logbook.

[Intruder]

Research your country's regulations to find out when you can log PIC and SIC time.

I do not log night time except for the time I am in the seat at night.
I do not log Instrument time except when I am PF and in the seat.