60 kms is a shortish ride for me. 80-90 kms is a good ride, 100+ kms is a long ride. The longest to date is 117 kms couple of years ago, but then I did a charity ride two weeks ago and did 116 kms the first day, and 111kms the second. Felt totally fine the next day and wished I could ride another 100.
We usually tour, so there's only as much ground you can cover if you're sightseeing at the same time. We aim for 60-80 kms days when we tour.
It all depends what kind of riding you do, as long as you're enjoying yourself, the distance really doesn't matter.