by 
Metaphiz
ANSWERS: 1
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I suppose it takes about 40 seconds or less for current jetpacks to be burnt out. "The great disadvantage is the limited operating time. The jet of steam and oxygen from can provide significant thrust from fairly lightweight rockets, but the jet has a reasonably low exhaust velocity and hence a poor specific impulse. A man's carrying capacity before take-off sets the upper bound on weight of propellant that can be used, and so currently such rocket belts can only fly for about 30 seconds." Source: http://en.wikipedia.org/wiki/Jet_pack
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