The condensing would be from 4 to 3 weeks for the ground school portion only. I would also assume, but call to verify, that the length of time the classes run throughout the week would be extended so that the total class time would be the same. Since you are charged for each hour of class time, it's probably safe to assume they wouldn't reduce the number of hours you'll attend class.
The 10 week estimate is to complete the entire program including the flying portions. That's a conservative estimate. If you work hard, you can finish much quicker.
Good luck.