Fifty two miles with 620 curves and...
...fifty nine bridges.
And the trip, if done right, will take you all day long. The trip to Hana isn't about getting to Hana, it's about seeing the sites along the way including the rain forest, waterfalls and breath taking views of the coast line. It's well worth the day it takes to do it right, stopping along the way to take in the sites and have a picnic lunch because there are no restaurants along the way.
You can eat in Hana as long as you are willing to pay a very high premium for a mediocre sandwich or burger.