Ten to fourteen thousand real draws: a month or more for an average vaper, two to three weeks heavy. The battery will need charging dozens of times before the liquid is done, which is normal and by design.
Not within the device’s working life. Nicotine salt liquid darkens slightly over weeks and flavour softens a touch near the very end, but a month-long device finishes well inside the window where any of that matters.
If you love the format, buy the pod-based models and reorder pods. If cost is genuinely the priority, this is the point where a refillable kit plus 100ml shortfills beats every prefilled option; our budget vaping guide runs the numbers.