You can spend the whole day depending on what interests you. The cable cars start nearby and they are definitely worth the ride. Get your tickets on-line and save.
3 hours is enough
I think if you are into souvenir shops there are plenty to look at. A small amount of restaurants a fishing tackle shop and a few rides for kids also viewing the sea lions on the pontoons. I think 2 to 3 hrs is plenty. The car park opposite will cost you $15 an hour or $50 if you stay 3 hours or more.
One day!!
I think 4 hours is enough to explore the pier and the neighborhood
Well, for a while
One day is enough
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