I start early but about the time that I usually wake up, 3:30 or 4:00. Working WITH my natural rhythms seems to make sense to me. If you don't usually wake up early then trying to start then would be a struggle right at the start.
I have done several 1000-mile days that were not planned as SS1000 rides, it just happens that I have a destination 1024 or 1050 miles away.
I do these trips with zero tolls -- 2-lane roads are far more interesting to me than freeways. That choice makes mine take a bit longer, 21 or 22 hours.
"The belief that there is only one truth, and that oneself is in possession of it, is the root of all evil in the world."-- Max Born, Nobel Physicist