hey all... i have only previously ridden around campus (2 miles max) so it was never a big deal to not carry around flat-fixing gear. but to fend off winter break poundage i decided to go on my first lengthy ride, and bought the necessary emergency stuff (levers, tube, CO2 inflator). in order to save limited pocket space, i installed the cartridge in the inflator... akin to a balloon, will the cartridge slowly start to "deflate"? if, by the grace of your deity of choice, i dont get a flat for, lets say, 6 months, can i assume that the cartridge will be able to get my tube up to a decent pressure? i just dont want to be fixing a flat and end up with a tire at 20psi.