1hr+ for a general update* (following the guide. Pre-kernel)
On a more serious note, gentoo is fun… On competent hardware. This is a 4 core Celeron N2940 with 4gb of RAM.
*emerge --ask --verbose --update --deep --changed-use @world is too long to type…
Gentoo is fantastic for learning. It forced me to get intimate with internals I had no exposure to before. And I learned a lot of little tricks from it that accelerated my career. Or at least made it easier.
I’d try to find something a bit more beefy if you plan on compiling almost everything. And once you get it where you like it, take a backup or system image you can restore to. Because when it breaks, it’ll be a lot less painful to start over.