That depends a lot on you, how you vape and what kind of eliquid you buy! On average, though, a 60ml bottle of eliquid should last approximately 7 days. If you use a vape at a high wattage, or are a heavy user, you may go through 60ml quicker than this. When deciding on an eliquid, consider how much you vape on a week to week basis, and also what different eliquid flavours you may like to try over the course of your vaping.