According to Cue Vapor, a single cartridge can last anywhere from one day to a week or even longer, but this depends heavily on how often the device is used, and because everybody is different, it's hard to estimate. If you were a heavy smoker and have your Cue in-hand all day, then your cartridge will deplete much quicker than it would for an "occasional smoker", who might only use their device 3 or 4 times a day.
We recommend checking the e-liquid level often to help determine at what rate you're using up the cartridge. You'll then get a better idea as to how much you're using it and you'll be able to figure out when best to order your refills.
As a very rough guide, we estimate that heavy users should get 2-4 days of use out of a single cartridge. With medium use (occasional "smoke" breaks at work for example) you could get 4-7 days and if only used a couple of times a day the cartridge can be expected to last a week or more. Bear in mind that if you're "chain vaping", naturally the cartridge won't last much longer than a day.
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