Originally Posted by
AdamFrisch
It is what you agree on. There's no rule that says you can't log time from the right seat. But you can't both log that time simultaneously, unless it's a 2 crew ship.
Or one was an instructor logging Captain, and the other their student logging P/UT.
Which may be what the OP's friend was actually told, as it would be true throughout the dual part of his training.
P