Nearly six and a half years --- but there is one big negative side-effect: all the damn little mod, RTA, and RDA boxes ... I mean, they have spare parts so you have to keep them right? You can't just dump all your parts into a bin and hope you can find the grub screw for this RDA or the Oring for that tank when you need it ... and you don't want to buy a bunch of baggies and a label maker and labels --- that's good mod money right there ... so you need space for all your mods, and for all your tanks/RDAs/RTAs, and for your batteries and chargers, AND for all the damn boxes. It's a nightmare, really ... When I smoked I could just throw away the package when it was done.