The answer to 'when to replace emergency roof repair' is that emergency roof repairs are meant to be temporary fixes, not a long-term solution. These quick patches are used to stop immediate leaks or damage, but they should be replaced with a more permanent roof repair or replacement as soon as possible.
Emergency roof repairs may last anywhere from a few months to a few years, depending on the severity of the damage and the quality of the temporary fix. However, they are not designed to withstand the elements indefinitely. Homeowners should plan to replace an emergency roof repair within 1-2 years, or sooner if the patch starts to fail.