Ive found that if my B24 is set afire, it will burn anywheres from 5 to unlimited burn time. Usually it will burn up within 5-10 mins though...unless...my pilot is wounded. Of all the times my pilot is wounded and the plane is burning at the same time, the pilot wound seems to supersede the fire as a damage effect...and the blackouts of the wound seem to want to play out before letting the fire kill me. Weird I know, but thems the facts thusfar.