Drug info - New 2 ---> Nitrous

[Synthesis]

There is this dude I know who is new to Nitrous. He researched far & wide over this new technology called the "internet." Using this "internet," he found out that, other than his routine yearly checkup at the dentists office, the most convenient means for experiencing nitrous was to invest in a nice $XXX metal cracker, a $XXXbox of ISI 8oz metal cream chargers, and a few $XXX 'bunching-bag' style balloons.
However, when the dude dispensed the gas into the balloon using the metal cracker, he could not remember if he should release the gas quickly or slowly. He vaguely remembered that "the internet," recommended he let it out slowly. But the dude tried releasing the gas at both speeds & was equally disappointed with the results. The results were disappointing to him because the overall volume of gas released by the 8oz cream chargers was not what the dude expected. The dude expected to obtain about 1-3 lungs worth of gas from each charger released into the balloon. Unfortunately, for the dude, he only got about 1/4...if that.
As a result of all this mess, the dude is desperate for anyone’s advice. He wants to know how slow the gas should be let out, basically an estimation or average time per cartridge. He also would appreciate if anyone would let him know if he has to dispense multiple chargers into the same balloon or if he has the wrong chargers. Why isn't the dude getting the expected 1-3 lungs of gas, I guess would be the main question of this paragraph.

Is there anybody out there who can help the dude out?

P.S. if anyone else is New 2 Nitrous & has questions, comments, or concers, please post them.