I know in the description it says screen size, but I was wondering if this was correct.
Would having the option to scale the game to full screen not meeting this critea?
You have 48 hours time to make in game. The 9 days is just the time frame in which you can work on your game. In other words, you could spend the first two days working on the game and then you are done, or the last two or split the hours so it fits best for your schedule.
After the 9 days the games will be rated. At least that's the way I understand it.