I was thinking, maybe make many mini-games about one basic land like the forgotten realms books.
Please use the term "Short games" if you are talking about separate games and the term "mini-games" for a game inside a game (like Modern said: Blitzball in FFX, Caravan in Fallout: New Vegas, ...)
It really confuses me, and probably other people too.
If you say short games should last at max an hour, well then, I don't think so. I know an RPG that lasts, for most people, about 12 hours to complete all main story quests and they think it's a very short game. Other people tend to do all side-quests as well and they go up to 15-20 hours?
RPG's can easily last for lets say 150 hours and still be good full games.
Short RPG's are less then lets say 15 hours... However, I'm currently working on a Time-based Mystery Horror RPG and my deadline is October 31st. My goal of game-time is about 1 hour at most, but I change this quite a lot as I'm already at 5 minutes in the first map if you know where everything is and what the NPC's say...
Also, if you'd like to create some short Fantasy RPG's on the same world, I'd tell you to read three trilogies by Licia Troisi. They are all about the same world, first one is now, second one is 50 years after 1 and the third is again 50 years later or something?