Google maps says Minneapolis to Chicago is 409 miles, so three hours seems like a pretty achievable goal. Also, the flight is 1.5 hours, but the actual travel time is probably more like 3-4 when you factor in getting to the airport, waiting for the TSA, etc. Plus, you're moving around and being annoyed for a lot of that time, whereas you can plunk down on the train and nap/work/etc.
I think aiming for a comprehensive network right out of the gate is bad idea. Instead, build it now where it makes sense now...and build more later where/when/if it makes sense later. You could even add some fairly short routes. If someone can get Boston to Providence/Wooster/Manchester down to ~20-30 minutes, it'd be a huge win for that entire metro area. People already do those commutes but they're on the longish side.
I think aiming for a comprehensive network right out of the gate is bad idea. Instead, build it now where it makes sense now...and build more later where/when/if it makes sense later. You could even add some fairly short routes. If someone can get Boston to Providence/Wooster/Manchester down to ~20-30 minutes, it'd be a huge win for that entire metro area. People already do those commutes but they're on the longish side.