Longest flight by burning plane
What is the longest time any aircraft has flown while on fire?
There are several notorious disasters from planes that caught fire. Swissair MD-11, which crashed in 25 minutes or so. Saudia Tristar. Manchester B-737 which burnt on runway. Some B747 crashing in Indian Ocean... All of those were doomed in a few minutes.
Is it the general rule that any plane that catches fire crashes in less than half an hour, unless it happens to be near an airport and land in less than half an hour?
And does it follow that any aircraft farther than 30 minutes from a diversion that catches fire has no chance at all?