You need plenty of time to really enjoy the whole museum. There's a rich and very good audio guide through the museum with a specific child version (really good!) telling you the whole life of Mozart. It's fascinating to stand in the rooms where Mozart used to live.
Over all you need a lot of time if you want to get everything but fortunately you can skip not only rooms but also parts of the audio guide and compile your own tour with just the pieces you're interested in.
Staff in the shop has the unpleasant habit to manipulate your input into the credit card machine, i.e. they try to select the currency you're going to pay with.
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