I agree with Bekologist: it's not the distance, it's the time. Fortunately, I have a lot of time. I have no real problem covering 200 miles in a day if need be, but that would be severely curtailed if I had slower riders with me or there were other constraints. When I visit my dentist (730 miles away), I ride my bike but it does take me a week to get to him. Tomorrow I am riding to the next town to pick up 150 pounds of tomatoes to can. After that I will ride to the next town in the opposite direction to deliver some of the sauce to a disabled friend. I suppose I see the time spent getting around on my bikes as my play time so it never seems like a burden.
There are trips that I have chosen to not use my bike for. In 2008 I rented a car to take my son and a friend of his to compete in the State chess championship. The following year I rented a car to go to that same friend's memorial service; he had died in a car wreck.