Coil life depends on coil type, the coil's resistance, frequency of use, and the type of vape juice used. Vape coils can last anywhere from a few days up to 2 weeks.
Replacement is indicated when a burnt taste is noticeable and there is poor cloud production.
A lower resistance coil will heat up faster and produce more vapour, but will also use more battery power. A coil with a higher resistance will take longer to heat up but will use less battery power.