If you can manage a heavy 737 BBJ that’s probably your best bet (I did 20 hours, 6 minutes once). Although with the flight mechanics of this game just take a 777-200LR with max fuel and nothing else, redline the engines, and enjoy your 4000 foot takeoff into a 32 hour flight.
This is what I have on file for the 737-700 (which comes close enough to sharing its fuel burn with the BBJ that I didn’t bother testing both of them). The BBJ carries a little bit more fuel though I think so I calculated 19 hours flat for the -700 and 20 hours 2 minutes for the BBJ. Green is flying east and blue west, and those are load percentages on the left
Entirely fuel. The -700 and BBJ have apparently been merged into one model (which I didn’t know) so now both of them can carry 15:13 fuel. I’m not sure if there’s a fuel burn difference to differentiate the two now but just try the BBJ.
My statement in a previous post about the -700 carrying less was incorrect, the second time I had written (20 hours) is what happens if you max out the fuel. This causes a load percentage of 113%, which is what accounts for the extra hour (I think - untested, it might actually be more because I swear it used to be 106% max). 13% load on a -700 is about 10000 pounds, so I would expect at least an extra hour and change out of it (maybe 20:30 possible).
But if you want to stay under MTOW 19 hours is probably reasonable.
Pertaining to the actual takeoff itself, it’s not really a worry. At 113%, flaps 15, 30% trim the aircraft will leave the ground around 130-135 knots which is achievable with less than 4000 feet of runway.
Ok thanks. I have a particular crazy long haul flight between short fields I now need to try. By short I mean in the 5000ft range. Out of curiosity I noticed the recent “stop the float early” hard landing injury incident recently reported at KSNA I think, has a length of 5709 ft (though of course near sea level).