2 years back it took me 6 hours to travel approximately 70 miles heading from Lake Arenal to Monteverde. I had it in 4-High most of the way doing 20-25 MPH at best. Some places we did end up shoving the Pathfinder in 4-Low and CRAWL about at 5-10 MPH, though these were few and far between...
I've gone "mudding" in farm trucks and taken a John Deere farm tractor places that were less of a challenge than some of the roads I've tackled down there.
You know the roads are bad when you are tring to get a SECOND spare from the rental agency to slap on top of the truck...