I just honestly think it's hillarious that shops say you can get a LONG life out of coils without taking into account the amount someone would use it during the day. I swear that most shop owners are convinced that these tiny coils will last for weeks on end, when in reality, the average vaper will burn through one in a matter of a few days to a week if they JUST vape and don't smoke. I have and RBC's, apsire nautilus, kanga tanks, ect... and I rarely go 3-4 days (using it consistantly) before I have to change the coils. i have never had a coil last week a week (unless i'm using different tanks during the week)