Do you mean longest leg without refueling? My longest non stop flight was Scottsdale Arizona to Long Beach CA, around 3.7 hrs - probably one of my longest flying days Long Beach - Scottsdale - Long Beach, all under the hood SIT with a safety pilot, a bit over 7 hours...yawn....Got back at 3am. (Had a great laugh flying in over San Diego, switching on the runway lights of all the airports we overflew, some poor French bloke started getting into a flap when we switched on Montgomery Field's lights. Apparently he was on the ILS or something and suddenly all the lights came on "err..socal....who else is on final...the lights have all come on...negative on the traffic....where iz hee?....i cannot zee imm"
)
Another long day was Long Beach CA - San Louis Obsipo CA - Harris Ranch CA - Columbia CA - Bakersfield - Long Beach, another 12 hourer.
Cheers
EA