Hydrogen peroxide powered rocket packs fly for around 30 seconds, because they have a specific impulse of around 125, meaning that one pound of propellant can make 125 pound-seconds of thrust, meaning that it takes about two pounds of propellant for every second you are in the air. Mass ratios are low for anything strapped to a human, so the exponential nature of the rocket equation can be safely ignored.

A pretty hot (both literally and figuratively) bipropellant rocket could manage about twice the specific impulse, and you could carry somewhat heavier tanks, but two minutes of flight on a rocket pack is probably about the upper limit with conventional propellants.

However, an actual jet pack that used atmospheric oxygen could have an Isp ten times higher, allowing theoretical flights of fifteen minutes or so. Here, it really is a matter of technical development, since jet engines have thrust to weight ratios too low to make it practical. There is movement on this technical front, but it will still take a while.

John Carmack

ill-defined caveat regarding the nebulous property of 'percieved value to others'.

It is not nebulous or ill-defined at all, it is quite plainly spelled out in the narcotics laws of your local jurisdiction, which are by definition the local standards for materials that impose a higher perceived cost than benefit. If none of this makes sense to you, try Tierra del Fuego, I hear you can set up your anarchy there for little cost.

It's like he knows one of the guys who makes up the trivia. It's really incredible.

I had only heard about him until two days ago when he won his 25th in a row, and his winnings for that day were only $14,000, which was his lowest in all 25 games.