I did a 31 mile commute like this for several years, with just over 4 miles from home to transit, about 2.5 miles from transit to work, and air conditioned light rail in-between.
In Dallas, as long as the trains were running when I needed them, I could easily shave 10-20 minutes off each end of a commute by biking to/from the nearest station rather than waiting for a bus.