The service life depends on the individual parameters of each product range:
VGOD Stig - for about 300 puffs, which replaces one pack of regular cigarettes.
VGOD POD 1K - designed for 1000 puffs, so it will last at least 7 days. The exact number depends on the intensity of use.
VGOD E-Juice - comes in 30 ml and 60 ml packs. This is an impressive volume, enough for multiple refills.
VGOD SaltNic - also sold in 30 ml bottles. If used slowly and evenly, it can be used for a long period of time.
In all cases, the life depends on the intensity of your smoking and the strength of your inhalation.