A lot less time?
On short legs that's not true. It's minutes saved. The problem is saabs NEVER went ORD to SAV. CRJs do it and longer legs too. So the argument of RJs taking less time to be uncomfortable doesn't hold water. They just made the city pairs farther apart.
The only reason the word "regional" is in CRJ and ERJ is so mainline management could sell the loss of scope to those pilot groups. The city pairs are NOT regional and pax spend way too long sitting in uncomfortable aircraft.
30 minutes in a turbo prop, okay... 2.5 hours in a CRJ...not happy. Again, mostly nobody cares what pushes the air. People just hate to be cramped. I'm happy for CRJs. I've got over 3,500 hours in them with 1K+ PIC. They still suck. People hate them and theres a reason why. Too far for too long while too cramped. I'll take the 40 minute Saab or Dash-8 ride any day.