At least 1 hour but you can spend a long time if you like nature. Just do not go during the winter or a cold day. I did it and the wind was ruthless. Plus bring enough water and snacks since isn't any store nearby.
Agree 2 hr min first time there. If you like hiking one could spend several more.
It would be best to hit on a warm day, but we were there for about 2 hours, there are a lot of beautiful little caves and private enclosures with beautiful and romantic views
About 1.5 was enough for us. Cool formations, but not much variation.
To really see it, I'd say a minimum of 2 hours.
I've been there several times and once we took visually impaired students (we were there at least four hours). The shortest time we were there is two hours because there is so much to see especially if you like nature and its wonders with colors in the earth and shapes and forms created by wind and erosion.
I'd say 2-5.
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