I built LFS like back in 2005 or something. I remember it took forever. I wonder if it's faster or slower now. My computer is definitely faster, but I also have a creeping suspicion the code has gotten a lot bigger. Then at some point I switched to gentoo. I remember I vacillated between gentoo and slackware. The important thing was that I had an onion on my belt, which was the style at the time.
I would definitely recommend going through LFS to anyone maintaining Linux systems, it really helps you understand how things work.