i should point out that its best to make your own mod folder instead of editing the game source files directly. both methods will work, but its best to leave the original game files as they are...
look in the actor.def file. in there you'll see "burnaway" "4". change that to "burnaway" "3600" to keep the burn effect from playing for an hour. also you'll see "removeDelay" "5". change that to "removeDelay" "3601" to...