The 40 minutes is if you go straight through. If you're taking time to stop at overlooks and enjoy, you should plan over an hour. And depending on your plans, you'll need to plan the return trip :-). I suggest taking some picnic supplies and stopping at an overlook.
Not sure, but you should be able to go google it
I can't imagine to just drive from one point to the other. The views are worth stopping to see. It took my husband and I 6 hours to drive about 3/4 of the road.
We just followed maps. So I barely remember. Happy googling
40 mins (28 mls) according to Google maps
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