I would think 30 minutes. Walking in the sand is hard work! I also went with kids though and that takes longer. For a quick view and pics I would park at the stores across the street and enter that way
20-30 min easy
Some of the best photo spots are at the sound side of the dunes, which means walking the entire length of the dunes. I'd give yourself a hour if you really want to get quality shots. There are a few good places right at the entrance of the dunes if you're really looking to be fast, those would only take 15-30 minutes (but the water will be no where in sight).
30mins - 1hr. The experience climbing the dunes and the photos you'll get are totally worth however much time!
About 15-20 minutes. Gives you enough time to get to the tops of the dunes for good pics.
If you have smaller children I would plan 1 hour or more. Its a very nice place why rush it. Its also Free. Follow the boardwalk to the sand then go up the hill for the Best Pictures
I agree that an hour and the sound side is best.
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