There's nothing typical on the 175 ORD schedule. If you are on reserve and junior you will spend a lot of time waiting for nothing. Senior reserve you can pretty much do what you want, want to fly? click call first. don't want to fly? leave call first off and enjoy paid time off.
As stated above, the majority of trips are 4 days (more than 50%), locals vary from 5-10% depending on the month, 3 days come second (20-30%).
If you're a lineholder you can pretty much pick to fly as little or as much as you want.
You will mostly fly 2-3 legs per day, 4 sometimes. There are some rare 5-6 legs around.
You will definitely fly all over the place. East coast, midwest and west. Monterrey Mexico and about 4 places in canada.