I usually go by the way the coil looks. If it looks significantly gunked up after cleaning it then I re-build. For the cotton I go by taste and if it's starting to look discolored when it's dry. Since you're using a tank, I would check the wicks either every day or every other day and see if there's any discoloring. On my drippers I fire the open RDA for a few seconds while blowing at the wick until it dries a bit and see if it's discolored after I suspect it needs changing.
I have 4 tanks I use daily and I do them all at the same time once a week just to keep the cotton fresh. I change the coils when I feel like it's not vaping well, or I'm bored and want to try something different
As mentioned depends on usage , watts , juice.
Most people after a while just change when they want to , for some it will be sooner than needed and others longer.
It's usually obvious when you've gone to far with a coil/wick.
I change cotton out once every 3 or 4 days (or longer if I can pull it off). As for coils? My coils last forever. The coils in my Doge are easily reaching the 1 year mark, and still going strong. A good dry fire + a rinse in between re-wicking cleans em off perfectly.
mcdole - It sounds like your using the rebuildable deck for the Sub-tank. I'd recommend looking for a you tube rebuild tutorial. there are some good ones out there. I'd don't think I'm able to post a link, but try googling Sub tank rebuildable deck modification video. A reviewer named "The Don" has a pretty good one. The rebuildable decks on the sub tanks tend to have some wicking issues that are easily straightened out.
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