Earlier quoted context omitted.
> The build takes about 30-45 minutes If you don't actually need all the drivers, you can use "make localmodconfig" to substantially reduce that. My local kernels build in 90 seconds on a 32-thread desktop machine :) The kernel is a lot more stable than people think: I run the daily linux-next on my Debian stable gaming PC to look for bugs, and I don't find very many.
You're being a bit disingenuous, it builds in 90 seconds because you build it daily and the vast majority of objects are unchanged and cached by ccache.
A stripped down cold build will literally take 90 seconds without caching on modern hardware.
The overwhelming majority of stuff that is being built is drivers, and most of them probably aren't needed for any specific user, so you can disable quite a lot of stuff.
Fwiw a full build of the fedora kernel config takes around 5-10m for my 12core ryzen 3900x, and it's definitely not the fastest CPU around.