If you are asking how long will one last until you need to refill it, maybe 3-5 hours depending on how heavy of a vaper you are.thanks for that!Also I've been using these cartos for 4 days now and they are incredible everything in vaping I ever wanted. Quick question, how long does single carto last you for?
If you are asking when you should replace it with a new dual coil, I say about two weeks. I keep three filled with my three favorite flavors. They will last me all day. I refill them in the morning. I had one I was going to see how long it lasted, and didn't change it out for a month (my main juice carto). When I finally changed it, the difference in taste was noticable, but not huge. I would suggest to use until you can't see through the middle (about two weeks).