The number of puffs that you will receive from delta 8 cartridges greatly relies on the size of the puffs you inhale. Larger vape hits pull more vapor. Thus, longer puffs will shorten your vape's lifespan. ConcentrateCon recommends shorter puffs of about 1-3 seconds for better results. That way, one may draw 3-5mg of the vape at a go.
At that rate, a 1ml cartridge will provide between 160 - 320. From there, you may predict how long your delta 8 cartridge will last, based on the rate of use If you vape a small puff each day, a 1ml cartridge may last for about a year. If you take relatively heavy and long puffs (10-15), your cartridge will last for just two weeks or so. It could help if you note that bigger puffs tend to be less efficient since more vape goes into waste during the process. In this case, smaller puffs are often better.