It’s not really a big deal, but I am currently writing this using a linux kernel I compiled from source, which certainly feels like an accomplishment. The Arch Wiki has made the process fairly easy to follow. I just took the stock Arch Linux configuration without changes for now.
The most important part of this is of course that I have the option to do that, to take the source code of this incredible project and build my own kernel binary.
I didn’t really keep track, but I would estimate around 10-15 minutes on a Ryzen 5800X.
I compiled my first Linux kernel back in the mid 90s, mostly on 386 and Dec Alpha hardware, interesting enough both were not that much slower than what you mentioned, I think the alpha (a measly 21066) took about 40 minutes. If you had asked me back then, I’d probably have imagined a minute or two, 30 years later. Guess it says something about how much larger the Linux kernel has become.
That just brings me back to starting the compile, getting something to eat, doing chores, and whatever else. Then when it was finally done, booting it up only for it to not boot because I forgot some checkbox. Repeat a couple of times. Nights getting the thing working. And then on the next kernel release, trying to make sure I remembered all the checks because it didn’t let you export the current config back then.
Last time I compiled a kernel it was on a bus-overclocked K6-3/500 (higher bus, lower multiplier).