Kind of a "sliding schedule" (in reverse). Monday, it's probably the 2-3 timeframe with a return at about 6-7 PM. Wednesday is probably 1-2, Friday, they guys seem to like an early quit and leave SPO at about 9 and get to Plummer by about 11 and back by 3.
Today (Wednesday) I happened to be at Costco when they pulled back into the yard next door at Spokane at 5:30 PM.