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Re:ExectOS – brand new operating system which derives from N... by exikyut on Wednesday June 19, 2024 @10:00AM (#40728383)
*Google*

https://en.wikipedia.org/wiki/Tandem_Computers: 1974 (50y) (semi-dead)

https://en.wikipedia.org/wiki/QNX: 1982 (42y)

https://en.wikipedia.org/wiki/VxWorks: 1987 (37y)

https://en.wikipedia.org/wiki/GNU_Hurd: 1990 (34y)

https://en.wikipedia.org/wiki/4690_Operating_System: 1993 (30y) (these run the self-service touchscreens at Costco's food section, IIUC)

It's surprisingly hard to query for "graph intersection between earliest first release date and most recent release date" :(

Re:ExectOS – brand new operating system which derives from N... by pengaru on Wednesday June 19, 2024 @11:43AM (#40729330)
"gestation period" != age
Re:ExectOS – brand new operating system which derives from N... by KerrAvon on Wednesday June 19, 2024 @11:11AM (#40729040)
I think the parent’s point was that Hurd is still unfinished. All of the others in your list shipped releases that met their intended goals in a much more compact timeframe.

edit: clarification