How much time is needed to sell the property?

Today, when information is available at a glance, we literally just get a little bit on our smart phones and go through several websites where ads are published and we know what sellers expect from their real estate. Many sellers are heading for their neighbor who also sells but still expects someone to "run" on his real estate and pay him an impossible amount. There are also those who are really motivated to sell, who have prepared real estate for sale and actively participate in sales with their agent. The rule of sale of real estate lasts from three to six months. This is real when you put in a true ratio the price and quality relationship. I understand that every vendor is thinking of getting the maximum amount as each customer seeks to get the maximum quality for the price he is paying. The sellers know very well what real estate price is, and when a realtor sells multiple times or reaches ads because his real estate sells so quickly that there is simply no need to be advertised for a year or five or more agencies then competing among themselves to have the lowest price. All this brings us to a problem that has been trying to regulate for a long time is that the tax administration gives us all the average cost of selling real estate in a particular area or in a specific neighborhood and would thus be much easier for everyone, because sellers would know what the actual average price was in relation to what they have today and that they have an average they are looking for the price and they are aligned accordingly. Unless this is regulated by law or otherwise we will have the problem of having the same property spanning two or more years on portals or offering it to five or more agencies.