I made a game in 7-8’ish hours. No inherited code, no asset sounds, no asset graphics.
The Ludum Dare is a famous game jam, for some reason. It contains a, “Hardcore Mode,” called Comp. Wherein you are expected to build a game from nothing in 48 hours. I didn’t have any time Saturday, so I made it Sunday. I like it, it’s a fun game. It is also, however, absolutely terrible and buggy. But fun!