My fastest 200k ever was a 11pm departure out of San Angelo, TX. July 14, 2017. 07:30 elapsed time, solo. I'll tell you what, I did that ride several times at night, and it's darned spooky out there in the middle of frickin' nowhere, with not a single car from midnight to 5am.
IIRC, it was still over 100F when I departed. But it's a dry heat, they say ROFLMAO. Dry heat sucks the water out of your body faster than you can drink. At least at 11pm-6am the sun isn't killing you.
It's a left out of the parking lot, then a right onto the highway, straight down to Sonora with nothing in-between except a closed down Eldorado, fuel and water at the Sonora convenience store, back north on the highway, left, right. Six turns, 201km. Nothing to keep you company but the wind, which guaranteed will be blowing one way or the other.
Cheers, from cool and green Oregon
