Wick life, and the need for coil cleaning, is also dependent on the juice you are using. Generally, dark thick juices will require much more frequent cleaning than clearer juices. Tennessee Cured, as an example, will completely gunk up a coil in just a few days and lead to either a subdued taste or a bad taste. Hype, on the other hand, is very friendly to coils, with coils in clearos, cartos, whatever, going for much longer period of time before cleaning is needed.