For me, at least, it seems to depend on the juice, which makes some sense. Heavy, dark juices tend to gunk up the coil faster and they don't clean off as well. I have had coils last about a week, cleaned it, worked fine for another week. I've had one coil that lasted a week but after cleaning never did work right so it went in the potentially-rebuild-someday bin. The BVC coils are pretty new so I haven't run any of them for terribly long