The longevity of Finish dishwasher tablets depends on how frequently you use your dishwasher and how dirty your dishes are. Typically, a single dishwasher tablet is designed to clean one load of dishes, including plates, bowls, glasses, and utensils, in a standard dishwasher. Therefore, if you run your dishwasher once a day, a box of Finish dishwasher tablets with, for example, 30 tablets, would last you around a month.
However, keep in mind that if you use your dishwasher less frequently or have smaller loads, you might get more uses out of each tablet, extending the overall usage time. Additionally, some dishwasher models have different wash cycle options, such as eco-mode or half-load, which could affect the tablets' longevity.
It's essential to follow the manufacturer's guidelines and recommended dosage for your specific dishwasher and the level of soiling on your dishes to ensure optimal cleaning results and efficient use of the dishwasher tablets.