Are there statistics on cycling trip distances?
Here's an article focusing on some of the most active cycling cities around the world, and this is reporting averages, not maxima. The source data they link to at Strava isn't available to me (redirects to the Strava login page, and I don't have a Strava login).

The data is probably biased towards more serious cyclists--I'd be surprised if the average commuter in Amsterdam is bothering to log in to Strava every time they go out.