https://www.maine.gov/ag/consumer/law_guide_article.shtml?id=27922

“Maine’s implied warranty of merchantability applies automatically to any new or used consumer product for up to 4 years from the date of purchase, depending on the product’s “useful life” (life expectancy). For example, you purchase a highly rated food processor that comes with a 2-year express warranty, but your warranty protection doesn’t end after 2 years. Assuming proper care, the food processor should last for at least 4 years, which is the length of its implied warranty of merchantability.5 If the useful life of the food processor is more than 4 years, the length of its implied warranty is still 4 years, which is the upper limit of time for any implied warranty of merchantability. If a product’s useful life is less than 4 years, the implied warranty for that product is the length of its useful life. For example, a soccer ball that you played with every day is probably at the end of its useful life when, 2 years after you bought it, it won’t inflate anymore. The length of the implied warranty for the soccer ball is 2 years.”