While the idea of a 1 hour game jam sounds fun, I really think it’s kinda pointless. It just motivates people to memorize a set code pattern and crank it out as fast as humanly possible.
I don’t think I could even program anything functional in an hour from scratch, even my silly settings menu I’m working on right now has taken 3 days. I couldn’t imagine making anything that wasn’t a poorly coded pong/breakout clone in only one hour. Even less if I’m not allowed to use existing code I can copy/paste in. It’s just not realistic.
If you wanted to go for a ultra-short game jam, I’d suggest an absolute bare minimum of 16~ hours. That’s enough to make a half-ass’ed Atari quality game of some kind, and still have enough time to make it a little different than a generic copy-paste clone. Of course, if you allowed people to use existing code from other projects, or libraries, it would go a lot faster. But then you just favor the entire jam leaning to whoever has the most code pre-written they can plug-and-play.
Ludam Dare is about right, 48 or 72 hours (depending on if it’s the Jam or Compo) is just enough time for people to really hammer out an entire game, with unique concepts if they work their butt off. But 1 hour? We’d all just be making poorly written pong.