The time to complete a home appraisal varies and depends largely on the size of the property being inspected. Appraisers measure the exterior of the home to obtain the correct gross living area. They also walk through the property, taking notes and pictures to assess physical features such as number of bedrooms, additions, upgrades, improvements and/or deferred maintenance that can increase or decrease the value of the home. Anticipate the inspection lasting a minimum of 30 minutes.