I visited with my wife during the week and as it opened to avoid queues.
Price - seemed quite pricey, considering it was an audio tour and not led by an expert; luckily we qualified for discounted tickets.
Tour - a few of the numbers on the audio guide could not be found while on the tour! Also, the background music/interviews/etc that were not through the headphones were sometimes too loud so that you could not hear the audio guide!
Duration - a couple of hours is more than enough.
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