In the words of used, do you mean you have built them yourself from scratch? Gentoo is for experts as Akito said and can be even more time consuming than building Arch from scratch. I’ve used Arch OSES but have never ever built one, because I have not got the technical skill to do so. Such a lot to take on board, one mistake and that’s it, as you have to keep saving as you go along. I installed Calculate Linux last year which is Gentoo and got stuck, as I do not understand it’s way of doing things.
I’ve seen people on YouTube live create their own Gentoo Linux from scratch and the Live stream went on for days and days.
Below are the links to Zebedee Boss’s Gentoo build from scratch Live Streams, with help from the walking and talking Linux Encyclopedia Guru Serge, who has helped me in the past with an upgrade to QT. He knows everything there is to know about everything Linux from Gentoo, Debian, Arch, QT, Ubuntu, Fedora, Red-Hat, you name it he knows it.
Gentoo From Scratch Parts One To Five
(Part One) https://www.youtube.com/watch?v=wrPJlAWMx7A
(Part Two) https://www.youtube.com/watch?v=27iikpOqeoc
(Part Three) https://www.youtube.com/watch?v=ZER7qnbphyc
(Part Four) https://www.youtube.com/watch?v=dr9ThgErXYM
(Part Five) https://www.youtube.com/watch?v=VxCWfsxcpF0
The only way to learn Linux is to build it yourself, but Gentoo is a learning curve that can go wrong instantly. I hope these videos help.