How long?

[rebbonk]

The skydiving instructor was going through the question and answer period with his new students when one of them asked the usual question always asked: "If our chute doesn't open and the reserve doesn't open, how long would we have till we hit the ground?"

The jump master looked at him and in perfect deadpan answered:

Spoiler:

"The rest of your life".

[Melisandre]