Pristine woods is probably a bit of a high bar but you can get plenty of separation from neighbors with a lot less land, especially if some of the land is shared conservation space such as near where I live. A square mile is 640 acres which is a lot of land. Between myself and a couple neighbors we're on about 75 acres much of which is orchard, a Christmas tree farm, and adjacent woodland. We can see each other but we're pretty separated.