The 2nd runner definitely seems to have the harder part. I mean if both members have to be at their respective areas at 4:30/4:45 and if the first runner isn't released until later in the corral line-up and has a slower pace, the 2nd runner could very well be waiting 4-5 hours to start!
Good to know. My goal for my first marathon is just to finish and experience it without the pressure of time. I plan on trying out a few different pacing strategies (running all but slow, run-walk combo, etc) during my long training runs so I know what I want to do for the actual race.
My friend had ran the full a few years ago and she DREADED the higher-teen miles (17-19 if I recall right) because she said they were nothing but highway. Plus she was afraid of hitting the wall, which she did at mile 18.