The answer to 'when to replace pipe repair' is that pipe repairs should generally be replaced after 5-10 years, or sooner if the repair is showing signs of wear or leaking. Pipe repairs are not meant to be a permanent solution, and over time the repair materials can degrade or come loose, leading to new leaks or water damage. It's important to regularly inspect any pipe repairs and replace them before they fail to prevent costly water damage to your home.
Factors like the type of repair, the material of the pipes, and the age and condition of the overall plumbing system can all impact how long a pipe repair will last. In general, epoxy pipe lining and clamps tend to last longer than simple pipe patches or wraps. But even the most durable pipe repairs will eventually need to be replaced as part of maintaining your home's plumbing.