RE: When do you re-ring?
I run them until they croak.
Engines that I love (like my Super Tigre .90, my Super Tigre .45 and my Team Associated .15) will continue to live and breathe. I have extra sleaves, bearings, rings, pistons, and other assorted parts.
These engines I will have the rest of my life. I will run them in the future, regardless of any "Motor Laws," like mentioned in Rush's Red Barchetta