How long does the liquid in a can of compressed air remain flammable?

Question:I had no choice but to use a can of dust remover (air in can) to clear debris from a pilot burner on an old space heater. I didn't hold the can upright enough and dispersed liquid onto the surface. I will eventually go in to light this thing and I would like to avoid being engulfed by a fireball.

Answers:
It shouldn't be flammable at all. Spray some on a fireproof surface like a cook top and put a match to it. If it was the propellant used in some which contains some propane, it should long since have evaporated. The gas heater has vent air moving through it all the time.