Hey there!
Each cartridge gives you "at least" 100 performances. I have found that I end up getting many, many more than that. I have experienced easily over 200 per cartridge. 100 is simply a good, low number that you should always achieve, no matter how big of puffs you use or how well the catridge was made. It is just a low ball number.
If I were to say how many you get in real life, I would think that you would expect to get over 1000 puffs with one gimmick pack.
Let me know if you have other questions. Have a great week!
// L