1. You only want to charge to 90%, not 100%. It'll kill your battery faster if you constantly charge to 100% SOC. So 90% gives you about 214RM. In the winter my IC show 208RM. (Flasherz has shown that the RM changes seasonally)
Consider that in the winter, on long distance trips, I can get maybe 350wh/mi, instead of the 290wh/mi that the "208RM" is supposed to give me, you can expect only ~170 usable RM.
On short trips, I've seen 500wh/mi (several short back-to-back trips), which means if you need to run an errand, stop for an hour, run an errand, stop for an hour, you might only get 100 miles out of the car.
I would check evtripplanner.com to see how many RM you'd need for your 120 mile commute. That might be cutting it too close, and a 90D might be a better fit for you.
2. Yes, if you have a NEMA 14-50, the car charges at 30mph over night, so you can go from 0-240RM in about 9 hours (add another hour for the last few percent). If you never get it to 0 miles, then you need to charge less than 8 hours.
If you get dual chargers, and a 100A line, and a HPWC, you can charge twice as fast
3. Unplanned trips are harder in any car. The 90D will give you an extra ~45RM, if that'll help you take the scenic route, then your decision is easy.