It takes time to build up to distances and not everyone can do it. My longest ride in a single day was 150 miles and that was many years ago. Current fitness levels keep me in the 50-75 mile range and the upper end of that would be a long, hard day for me. As I have aged I have become less fixated on the total miles and more on what I can see and do along the route, to the point that some days I only ride 5 miles and consider it a good day.
Aaron