OK....all that sounds fine.
Now take the situation of a Bell 212 or 412 where I have flown the exact same operation both Single Pilot and Two Pilot. Same Contract, same route, same passengers, same bases, rigs, platforms, and field sites to include airports.
IMC, VMC, Day, Night...nothing different.
The Client changed the Rules to require a Second Pilot.
So...we did....both Pilots "Captains" who swapped duties each fuel load or run, and swapped seats at Lunch Time or mid-Shift.
Now explain how you would log all the time?