Some years ago I was in an organization trying to promote the use of cycling in our city. One way to do this was to arrange outings in the weekend, where we would go visiting touristic spots in the surroundings of the city (i.e. winemakers, farms, food fairs, etc.)
The distances we used to cover were ranging from 40 to 60 km on flat routes, and most of the participants were first time or occasional cyclists. Some even wearing high heels when we were supposed to take a walk in the countryside to visit some archeological ruins (sic!)
As long as we kept a slow pace, meaning that we stayed below 15 km/h, everyone always managed to complete the tour and enjoy it. And it was before the time of e-bikes.
This can apply also to you:
- keep a slow pace
- be sure to have water to stay hydrated
- be sure to have sugars available should you have a hunger crisis
- don't be afraid to stop if you think you are done
- if possible, try to progressively push your limit further away in terms of mileage, to find what your body can do