I'm working to get back into shape where doing 30 miles on my Breezer isn't a dumb idea. Then I can work my way up to 40 or 50. Most people wouldn't count that as a "short trip". It works because my Breezer fits me well.

A given bike rarely has distance limits. The rider is always the weak point for distance... they may not have enough conditioning, and if the bike and rider don't fit together properly, the rider gets damaged. Maybe a nerve gets compressed, or a joint doesn't move correctly, or the saddle rubs skin raw. Bikes are hard to break since they're metal. People are easy to break.

This is why the refrain you hear is to test ride. No one's body is the same as someone else's. What works for me almost certainly won't work for you. Hell, all the other Breezer owners on this forum have their bikes set up quite differently from mine... and the mods each of us makes or doesn't make end up being quite different. (donnamb's comes closest to mine, and if you do some forum searches, you can see how her setup changed over time... but when the similarities are we both have bike baskets, and we both ride on leather saddles, the setups aren't all that similar)