15 seconds is the mean average burntime on a lifeboat. Remember a standard wooden or paper match is essentially consuming the stick to transfer ingnition to tinder long after the very shortlived match head is consumed. A lifeboat conversely puts it's fuel in an extended ignition less subject to being extinguished. Always remember that whatever your firemaking strategy to THINK about every step like a grand chess master. This is serious stuff in the survival scenario, in many ways one of our oldest sacred ceremonials.