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It took about 23 hours to get it booted under its own power using a binary kernel. And on the 4th day (today) I've managed to get a custom kernel working. Gentoo has been very fun to use and to customize, and it's very fast and responsive, even on my old hardware and with a hard disk, browsing heavy webpages with Librewolf is no problem at all. I've been sleeping on Gentoo for WAY to long.
I've tried and failed in the past to get Gentoo booted. How long could it take to compile on modern hardware, like with a 16-core AMD Ryzen 9 5950x, an NVME drive, and loads of detotated WAM? I'm flirting with the idea of trying once again. My concern is I don't have another machine to fallback to, save my phone.