CIP Liners are permanent repairs. Current manufacturer specifications show CIP Liners are tested to last over 60 years. Industry professionals currently anticipate a 60 to 100-year life expectancy. In reality, CIP liners could last well beyond this. Part of the reason liners have an estimated life expectancy is there hasn’t been enough time passed since the technology was introduced to actually confirm when they will start degrading.  Either way you can rest assured your new liner will last for a very, very long time. Likely much longer than you will own your home.