How long will a great Pyrenees roam for?

Both of my GPs are rescues, and both were found roaming. My answer is that they will roam until rescued or found or injured. There are so many of these dogs in rescue or in shelters because people refuse to believe that they will roam. It has nothing to do with whether or not they're happy in their current home, or if they are attached to their owner(s). It's just the way they're made! It's in their very nature, and they can't change it!