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Stock debian is 5 years with their LTS project, but they have a paid "ELTS" project that adds an additional 5 years. So 5 years for free, 10 total years as a paid support option. https://wiki.debian.org/DebianReleases

No, all Debian releases are completely supported 3 years (1 full year after the release of the new stable release) and are LTS for 5 years.

Yes 2 years is the realistic lifespan in service. 3 is pushing it as part of the last year is spent on planning/upgrading. LTS is sub optimal.

And that is why RHEL is so valuable in enterprise.

When you see people still running PHP 5, or Python 2, and not for tiny little nonprofits either... there are large sums of money being thrown over the wall to support that.

That's probably because people pay to use RHEL, which funds supporting it for 10 years.