Henry is right. Twain borrowed Orion's journal of the trip to write that
section of Roughing It, so it has historical credibility some other sections
lack. They stayed in Salt Lake City two days, so that can be subtracted
from "road" time.
In a message dated 11/19/2014 8:34:55 A.M. Pacific Standard Time,
[log in to unmask] writes:
The University of California Press edition of Roughing It has a detailed
chronology of the trip west, miles covered, locations and time on pages
776-77.
Henry Sweets, Executive Director
Mark Twain Boyhood Home & Museum
120 North Main Street
Hannibal MO 63401
573-221-9010 extension 405