Hi, good question. My first game, Cubeeo (In Space), which should hopefully now be linked in my signature basically took me two full days, starting from scratch. I don't just mean starting the game from scratch. I also mean starting using Construct 2 from scratch. (Shout out to Construct 2 creators - great work!)
I had a vague idea of the type of game I wanted to create, but knew very little about programming. Granted, I do have a design background, and some tangentially related knowledge, but I think it's great that I could join here a couple days ago truly not knowing how to program a game, and then have something to show for it in two days.
These were two, very fully days (12+ hours, minimum), but I have a version 1.0.0 prototype of a game, which is exciting. I am now aware of it's limitations, and thinking about how to proceed with a new version. Also, all the assets I used were provided in the free construct 2 bundle. Thanks Construct 2!