I went looking but couldn’t find a reference. US Air Force Plant 4 in Fort Worth (where the F-35 is assembled) was at one point the longest length building without internal support columns. I’ve been told that there is a twin building somewhere else, but the one in Texas is 25 feet longer. I just can’t find a source with the number!
Reading the GitHub page for pythonz makes it seem a little easier to get into than pyenv. I think that might just be documentation learning curve though. Have you tried both?