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Screenshot of QEMU VM showing an ASCII Gentoo Logo + system info
I followed Mental Outlaw's 2019 guide and followed the official handbook to get up-to-date instructions and tailored instructions for my system, the process took about 4 hours however I did go out for a nice walk while my kernel was compiling. Overall I enjoyed the process and learnt a lot about the Linux kernel while doing it.
I'm planning on installing it to my hardware soon, this was to get a feel for the process in a non-destructive way.
I found Gentoo more helpful than LFS because with LFS you compile about 80 packages from source one at a time but you don't learn too much about the packages.
LFS gave me much more awareness of what packages actually come with a Linux install but Gentoo taught me more about configuring and booting a Linux system.
Although I'd definitely recommend both to anyone wanting to learn. I'd do Gentoo first then LFS.
Edit: LFS is also a masterclass in cross compiling so if that's something you're curious about LFS is the way to go.