If it is the thick one not as fast and it is called creep. I said melt and was corrected but that is what it looks like melted or chipped but from how I read up on it the plastic molocules get closer so shorter mabye? I dunno. If you use it till dead daily my guess is a month or so. If you use it on high it will be faster then on low. I have had the bottom piece break right off as I was removing it and it wasn't stuck. If you read some of the last few pages of the pn pro thread you will see with the high heat there seems to still be some issues with the thicker pong. I only use low so I am in a better position. All vapes have there pros and cons and this is the con of this vape.