It will last long enough for you to practice starting fires with it. Then replace what you have used.
You should practice all your survival skills occasionally. Especially fire starting.
Don't think that you'll need your fire starting skills on a warm, clear, summer day. You will most likely need it when it has been raining and you have slipped on a log, fallen chest deep into a fast running creek - spraining the thumb on your dominate hand in the process. Oh yeah - it will be getting dark and it is still and hour (or more) hike back to the truck. Did I mention it is January?
Try collecting wood and starting a fire with one hand as your core body temperature plummets and you start to shiver uncontrollably.
Owning a guitar doesn't make you a rock star - Owning a survival kit that collects dust doesn't make you a survivor.
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