High availability over long uptimes has caused the uptime leaderboard to retire, especially with Linux. But, you will find NetBSD servers running in the corner, under desks, in closets, in attics, in basements and co-lo facilities with high numbers.
$ uname -a
NetBSD aNONradio 9.1 NetBSD 9.1 (GENERIC) #0: Sun Oct 18 19:24:30 UTC 2020 mkrepro@mkrepro.NetBSD.org:/usr/src/sys/arch/amd64/compile/GENERIC amd64
$ uptime
3:27PM up 1066 days, 12:06, 1 user, load averages: 0.72, 2.71, 3.15