In 1920 it took 72 hours each way, leaving San Francisco at 0900 and Chicago at 1910; by summer 1922 it was down to about 68 hours.
It took 72 hours each way. This was in 1920. It was leaving San Francisco at 0900. This was in 1920. It was leaving Chicago at 1910. This was in 1920. It was down to about 68 hours. This was by summer 1922.