Final answer:
A certified rinse refers to the effective duration of a disinfectant, determined by tests where it must prove efficacy in at least 59 of 60 trials. This duration varies by product and is validated through rigorous, standardized testing procedures.
Step-by-step explanation:
When referring to the phrase 'a certified rinse usually lasts?' within the context of disinfectant efficacy, it can be implied that 'a certified rinse' pertains to the period the disinfectant remains effective after application. According to the Association of Official Agricultural Chemists International (AOAC), to determine this efficacy, rigorous testing is conducted where a disinfectant must show no bacterial growth in at least 59 of 60 trials to pass the validation test. These results must be consistent across different batches of the disinfectant and when the tests are performed on various days. The actual duration that a certified rinse lasts depends on the specific product being tested and the claims made by the manufacturer, which are verified by these use-dilution tests that align with standards set by entities such as the AOAC and mandated by the Environmental Protection Agency (EPA).