Property change duration refers to the time it takes for a property to be listed, sold, and transferred in the real estate market. In the United States, this duration has been fluctuating over the years, influenced by various economic factors, market conditions, and regulatory changes.

The average property change duration in the U.S. has been decreasing in recent years. According to the National Association of Realtors (NAR), the median time on the market for existing homes was 17 days in June 2021, down from 18 days in June 2020. This trend can be attributed to several factors. Firstly, low inventory levels have created a seller's market, where homes are selling quickly due to high demand. Secondly, the rise of online real estate platforms and virtual tours has made it easier for buyers to find and purchase properties, reducing the time it takes to close a deal. Lastly, the increasing popularity of cash purchases has also contributed to shorter change durations, as these transactions are typically faster and less complicated.

Data from the NAR also shows that the property change duration varies significantly across different regions and types of properties. For instance, in the Northeast, the median time on the market was 21 days in June 2021, compared to 16 days in the South and 18 days in the West. Additionally, the median time on the market for newly constructed homes was 3 months, while for existing homes, it was 17 days. This indicates that new homes tend to sell faster than older properties, possibly due to their newer condition and amenities.

In conclusion, the property change duration in the U.S. has been decreasing in recent years, primarily due to low inventory levels, technological advancements, and the popularity of cash purchases. This trend is expected to continue as long as these factors remain in place.