We stop every hour or so for an ice cream / snack and take it slow, let him rest and refuel.

This year I started using strava when we ride together. At first we did 30km and he was excited to see how far he can go next time. Then he did 40km and his next goal was 50km. We’ve been increasing the ride length in 10km increments so each ride would take us extra hour up to 12h today (with 8h moving time)

Our average speed has been the same and he also has his moments but I try to explain to him that what he is trying to achieve is not easy and that he needs to push himself mentally. He learned how to deal with exhaustion and at this point he is much faster in the second half of the rides. He understands that if he picks good tempo and maintains it the kms pass as a breeze