Notice:
The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.
Since you are trailer-sailing the boat, it should last a very long time, assuming the line is kept out of the sun while stored on the trailer. Check for fraying, and replace if you see any. You could also reverse the line or cut it and reconnect to the centerboard to change the spot where it hits the cleat.
Notice: The advice given on this site is based upon individual or quoted experience, yours may differ. The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.