How long should this coil last? I'm using only 50/50 mixes so far. Light to medium colors and no custard bases. Mainly Castle Down so far. Btw they are stock, I have not tried to rebuild them yet. I also wonder how long the rebuilt coils would last under the same conditions. I pretty much chain vape this thing, as it's such a joy to vape it's hard to put it down for long.