Until JAR/EASA it was a CPL requirement to do the 300nm in one day for the record
Did the reg actually say that?
I would find it very hard to believe because
- how would you define a "day"
- what if you get delayed (refuelling etc) and the clock goes past midnight?
- what if the clock goes past the official night start (whose definition is not singular anyway)
This is why the FAA doesn't define it and I have never heard of anybody else doing so.
Sure enough the FTOs probably do define it thus but they can do what they like, and they want their shagged old Duchess back the next morning for the next punter to sweat in for his £1000 170A "flight test"
There is no issue with knocking off a 300nm flight just to get the logbook entry but it is a bit of a waste of a few hundred quid to not get something out of it.