Having said that what happens if one pilot logs the first half of the flight and the other the second half? IE in an hour flight one acting as P1 for 30 minutes from the left and the other 30 minutes from the right? to save changing over with a landing?
On a long flight of say 4 hours it quite feasible one pilot could go for a rest in the back allowing the other pilot to P1 from the right.
Pace