How long should caulking hold up before redoing it?

Here is what I do First be sre you are NOT using silicone. I inspect my seams and roof twice a year. Any areas that are compromised the old sealant is removed and the area cleaned with alcohol. I use Dicor and Lexel. One is for the roof and the other is for the side seams. I meant to add. If you have any areas that are punctured use Eternabond roof repair tape. I had an area just to the rear of the front cap that got a branch in it. I covered it and the entire front seam with the repair tape.