To me the staying overnight (or even 3 nights, or 3 years) sort of falls in line with the whole log time as soon as the wheels move. At idle, I have over 24 hours of fuel in my plane. If I taxi to the runway, idle for 24 hours and then fly 51nm away to an airport, according to the people that say, "as soon as you move you log the time" I should be able to log 24+ hours of cross country time, because "hey you moved for the purpose of flight." They counter that it's ridiculous, but why is 24 hours not OK, but 2 hours for a ground stop acceptable? For *ME* (and my students, or anyone I'm going to sign off) moving for the purpose of flight is the takeoff roll. Taxiing to the pumps is just that taxiing to the pumps. Taxiing to the run up area is for the purpose of taxiing to the runup area. Same for the going to the runway. So for me, flight time is wheels off the runway until I land, and clear the runway. Though I usually look at the time when shut down, and then round DOWN to the nearest 0.1 hour.
So for overnights or what not, If you have to get up, do flight planning, check the weather, etc... I call that a separate flight. Because hey, if 1 overnight is acceptable, why not 12, or staying somewhere for a year, then if you always fly the same plane for 3 years straight, why not just log all of those 3 years as one single flight, and have a 194 leg cross country that spans 30,000 miles?
I just look at it as trying to 'cheat' your way to hours or ratings.
You know what's obtuse? Making up your own interpretation of regulations, which differ from the interpretation everyone else uses, and then telling everyone else they're wrong.
Logically speaking, if the FAA wanted the definition of
flight time to start at takeoff, then the definition would read "time that commences when an aircraft begins takeoff" instead of "time that commences when an aircraft moves under its own power for the purpose of flight".
Several chief counsel letters support taxi time as flight time,
even when not followed immediately by takeoff:
Chief Counsel to James W. Johnson, June 2, 2000:
In our opinion, the logic and principles of the enforcement cases and our prior interpretation support the conclusion that FAA-required de-icing procedures are "preparatory to flight," and when the aircraft taxies under its own power from the gate to the de-icing pad, it is "for the purpose of flight." Thus, we further conclude that flight time starts at the moment when the aircraft taxies under its own power from the gate to the de-icing pad, and flight time continues until the moment the aircraft comes to rest at the next point of landing."
Chief Counsel to Randall C. Kania, April 29, 2004:
In this situation, flight time starts when the aircraft first taxies under its own power from the gate, continues through the period of delay when the aircraft returns to the gate and in which the pilot must remain on board, and ends at the moment the aircraft comes to rest at the point of landing at the destination airport.
Chief Counsel to Barry C. Lloyd, April 27, 2007:
As with fixed-wing aircraft, flight time in a helicopter commences the moment that it moves under its own power away from its parking place for the purpose of flight—whether departure is commenced by lifting off or taxiing.