The home appraisal happens as part of the loan closing process, usually as soon as the purchase contract is signed or when the lender orders it to substantiate a refinance. The appraisal usually takes a couple of weeks to complete, though the actual appraisal event only lasts about 30-45 minutes. For conventional, FHA and USDA loans, appraisals are good for up to 120 days. For VA loans, appraisals are good for up to 180 days.