I remember when flying on a DC10-30 where flight time was expected around 10hrs 30mins to 11hrs. Captain announced that he was delaying departure for an hour or so until temp dropped sufficiently allowing more fuel upload therefore more chance of reaching destination non-stop. Temp at the time was +30c with light crosswind. The aircraft rotated very late! Reached destination Ok but had to sit on taxiway for at least 30mins until parking stand change was organised as allocated stand was blocked by broken down vehicle. I'm sure captain was not amused.