If you use Endomondo.com to track your unicycle rides, there are two challenges for 2016.

Max distance ridden in 2016:
http://www.endomondo.com/challenges/27856829

Max time in the saddle for 2016:
http://www.endomondo.com/challenges/27856825

There is a challenge for time because the unicycles with larger wheels have an unfair advantage in the distance challenge. Also, the trials riders can participate in the time challenge.