I've been vaping just over 2 months now, I'm retired and at home a lot, with about 10 different mods on the go, switching flavours throughout the day, using various clearos, so far I have only had to change one coil on a Kanger Aero, with the darker liquids I tend to wash them every time I empty a tank, the lighter ones every 2 tankfuls, let them dry, then dry burn them, that way they last longer.