People that worked on the same idea for decades
nityasnotes.com
nityasnotes.com
The painting is by Hokusai. Kanagawa is a place.
Brutal Mario started in 2006 at the latest, and ended in the 2020s as far as I recall, so about 14-15 years. Of course, the 2006 demo was technically demo 6, so we have no idea when the first 5 versions were created since they seem to be gone forever.
Super Mario Star World is a remake/sequel to the Mario 64 hack Super Mario Star Road, which was made for Super Mario 64 DS instead. It seemed to start out as a sequel in the Super Mario 64 engine in 2013, then ended up as a Super Mario 3D Land mod a few years later, got retooled as a Super Mario 64 DS hack a few years after that and is currently in development by a new creator after original creator SKELUX got cancer and moved onto other projects.
In other mediums, I guess there's the Thief & the Cobbler. Started in 1964, got an unfinished/messed up release in 1993, and a better recuts in 2013 and 2023.
Super Mario Bros X is arguably getting up there too, started in 2009 by Terraria developer Redigit, and now in development by a new group as of 2026.
And while a Doom fan needs to check this, I remember the mod Mordeth started before Duke Nukem Forever was announced, and the later episodes ain't done as of 2026.
> When was the last time that you thought about something for an
> entire hour? ... Howabout for a whole day? ... or over the course of a
> month? ... or a year? These are tremendously valuable moments, if you
> get to have them at all.
[1] https://www.youtube.com/watch?v=f84n5oFoZBcRichard Stallman: GCC and Emacs - both massive pro?ects and still going strong.
Linus Torvalds: Linux OS kernel
Science
Geoffrey Hinton: scaling neural networks
Books
Donald E. Knuth: Structure and Interpretation of Computer Programs (vol 4c of 12)
Buildings
misc. architects and builders: (most) cathedrals (Cologne, Barcelona, ...)
Neither are anything like a solo effort in the way these examples are, and it's hard to say what they'd be like without the long individual involvement.
Growing up in a retirement community you would be foolish to ignore the fact that some things don't start getting good for the first few decades.
Most everybody else doesn't have such overwhelming examples, and fail to realize it until much later in life, if ever.
Shelby Foote’s Civil War history and Robert Caro’s LBJ biography come to mind.
They also make me think I may have to work on READING them for decades.
Algorithms books and material by Robert Sedgewick and Kevin Wayne is 40 year effort too.
Computer Networks, Operating Systems, Distributed Systems from Andrew Tanenbaum, same.
J R R Tolkien
Janny Wurts
M A R Barker
Ed Greenwood