We went to the temple burn, and then finished the last bit of packing (1 hour?) and hit the line. We already hit traffic at the end of our block trying to get to the outer road.
A few people ignored the intersection sign asking for people to head to the outer ring, but for the most part the inner roads moved smoothly, as everyone allowed one car in, and then went in themselves. I was actually impressed by the vibe of the traffic and speed it moved.
The road conditions were terrible out to the exodus line, but we eventually got there after about 20 minutes of 5mph bumps.
Once we got to the "end" of the line, we spent three hours actually exiting. There was no pulse, it seemed like the gate was letting out about 3 cars per line in sequence, and then moving to the next line. It was a three hour crawl to the road, with maybe a 5 minute break maximum between moving at any given time.
I was glad to get out at the end, but it wasn't as painful as I thought leaving at that time would be. I admit, I think I left at the worst time possible (after temple, and not right away after temple) but I did it on purpose to gauge how bad the "worst" could be. I know people who miss the burn and temple just because of the line, and I think they are dumb. Leave later, not earlier. The worst case scenario is a little wait. Get a hotel in Reno or Fernley and have some rest before your drive. Leaving 24 or 48 hours early of burning man is just wasting your experience. You paid and prepped to get out here, why not enjoy 2 more days of whatever...? Never understand the early leavers...