I guess you guys are doing this in a different way but through about 10,000 carts in the year or two (~600+ every month) I have found you can get about all the "enlightenment" you are going to get with one about every 90-120 seconds backed up with oxygen to prolong the effect. The O2 will let you stretch it to 120 maybe even 150. That red doodad on the clear filter housing is a timer, kicked off from the switch on the operating lever.
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The timer lets you know when to reload?
Again i think the holy grail to nitrous use is to figure out how to get perhaps a 50:50 ratio of nitrous oxide to oxygen delivered as a constant flow. Although recreational usage might be higher, like 70:30.
The weirdest and perhaps most interesting thing about nitrous is the memories that you store in the nitrous trip that are forgotten after reawaking, yet can be accessed years later during another nitrous trip.