Mostly games except Europe take more than 1 hour. World games can take up to 4 hours. This is very irritating for players because all of us are busy persons. No time to play these large game so this game mode will make easy for players to play. This will help people how to manage time and it will be something new for players in game play.
You can always play casual mode.
Also, why play a quick game if you don't have time?
The only idea I like is just capture cities/countries.