I know the “rule” is every one to two weeks, but we all know it’s not always that clear-cut. Sometimes a coil seems to give up right away—other times it’s like it just keeps on giving. 
For me, it kind of depends on how much e-juice I’m going through. I usually keep an eye on how many mL I’ve vaped, and I’d say I tend to change coils around every 30-60mL. 
If I’m running a 30mL bottle, it’s often about one bottle, sometimes two, before I notice the flavor starting to fade or get funky. With a 60mL bottle, once I’m hitting the halfway mark or close to finishing it, I can usually tell it’s time for a fresh coil. 
Another big factor for me has also been the type of juice I’m vaping. Fruity and dessert flavors are my go-to, but man, they seem to wear coils out quicker. Maybe it’s something in the sweetness or thickness of those flavors, but I definitely notice a faster coil burnout with those. I’ve tried stretching it sometimes, but once you get that “off” taste, there’s no going back! 
So, how many mL do you usually go through before changing coils? Any tips to keep them lasting longer, especially with dessert flavors? 
I’d love to hear your experiences since we’ve all had those times when we’re low on coils and need to make ‘em last! 
Always hits the spot and feels awesome.