Nitrous How long will a Bottle Last?

[jams]

Hi,

I know there are many variables to this question but how long can you expect a 10lb bottle of nitrous to last.

I am thinking about a 75-100hp nozzle and just using it a few sec. at a time.

Nitrous seems like a fun addition, but if you have to keep filling the bottle every other day they it becomes an nuisance. At $3-$5 per pound, I would guess it becomes very costly as well.

Thanks