Last month I spent exactly 34 hours spread over a 5-day trip to Quebec City, Montreal and Ottawa. (over 2300 kilometers). Sometimes 8 hours at a time.
I'd get out of the vehicle and not even need a stretch. Awesome seats.
Yes, their firm, but thats what you want for long trips.
I have the Overland with the Leather if that makes any difference.
I find the lumbar way to hard and uncomfortable so I have it right in.(back)