In summary, an asphalt roof should last between 15 to 30 years, depending on various factors such as the type and quality of the shingles, installation practices, local weather conditions, and ongoing maintenance. Homeowners can optimize their roof's lifespan by selecting high-quality materials, hiring skilled professionals for installation, and engaging in regular upkeep. Understanding these factors can aid homeowners not only in maximizing their investment but also in ensuring long-lasting protection for their homes.