I frequently used to ride from Portland, OR to Astoria, OR in my 30's and early 40's. That was 100 miles each way. I was surprised it never took as long as I thought it might, and I never really even pushed it. These were leisurly rides, and I always arrived before sunset. I also rode from Portland, OR to Yakima, WA a couple of times back then as well. Those trips were almost 200 miles each way. Around the same time I also did several bike camping trips around Oregon and Washington. Sometimes on my own, sometimes with a friend. I don't remember the milege on those rides, but more than enough to qualify posting on this thread.
I'm no longer in a position where I can just take off and do something like that. But at 68, I still feel like I'd be able to, with a little bit of conditioning.
I did always want to ride across the country at least one time during my life. Pretty sure that won't be happening anymore. But you never know!
As I was struggling hard to make it up a very steep hill on one of those trips, a car passed me with a bumper sticker that read, "Easy Does It".
It rang so true that it forever changed my riding style!