"Into The Wild" After graduating from High School, where does Chris go? When does he return?

From the text:

After leaving Virginia, Chris drove south and then west across the flat Texas plains, through the heat of New Mexico and Arizona, and arrived at the Pacific coast. Initially, he honored the agreement to phone regularly, but as the summer wore on, the calls became less and less frequent. He didn’t appear back home until two days before the fall term was to start at Emory.