How often do I need to change my cotton in my mod?
Just change it when your hits taste funky or if you're getting a burnt taste. Not like changing your engine oil, where you want to change it every 3000 miles.
If you use certain thicker juices, you may need to replace the wick more often. Also, if you use a cinnamon, or strong flavored juice, and then want to switch to something else, I find that I can't get rid of the cinnamon flavor without changing the cotton.
I've had wicks last me over a week, and others not last two days... totally depends!
I do find that if it isn't wicking properly, and the cotton gets burnt, you'll never get that burnt taste out until you change the cotton, so keeping the wick wet is important in having your wick last a long time.