That depends on the market. There is no hard and fast rule. If someone told you 6 months, they’re wrong. The appraisal is good as long as the market doesn’t CHANGE. So, what changes the market?
Time of year can affect the market. Rise or fall in interest rates can affect the market. The stock market can affect changes in our economy. The unemployment rate can affect jobs. And, so can the weather. These are the reasons that lenders require appraisers to provide the most current market data available.
For these reasons, there is no hard and fast rule as to how long the value estimate is good for. The best advice would be to use the analysis as soon as possible.