I was thinking worst-case scenario would be 8-9 hours to get home. It took us TWELVE hours to get home last night (just after 1am). I-25 was an absolute parking lot starting about 20 miles north of Glendo State Park all the way to Wheatland. We then averaged about 20mph for the next 80 miles to Cheyenne, where there was another parking lot through the city (fortunately Google told us to take some side roads). For reference, on Saturday, we drove from Cheyenne to Casper in 2h30m. Yesterday, it took 9h30m to go the opposite way. I was finally able to go the speed limit once I hit Loveland, CO.

Every gas station and restaurant along the highway were jammed packed. I was actually surprised that none ran out of gas (or food).

I didn't see a single wreck, and just a handful of broken down cars (mainly flat tires). There were many people who stopped on the side of the road just to relax or go to the bathroom.

Even with that, it was totally worth it to go to Casper to watch it. The city did an absolutely amazing job with crowd control and overall organization. The city park where we camped was well-marked, and they even emptied/cleaned the porta-potties every morning. My dad took my sister and I to see the eclipse in Hawaii in 1991; and to be able to take our kids (and my parents) to see this phenomena was a wonderful experience.