It can be as short as 30 minutes, but if you want to stop through and see everything the museme has to offer it will take about 2 hours.
About 2 hours for thorough perusing
If you want to read everything and play with all the exhibits plus wander outside a while I would allow for more than 2 hours. I easily just spent close to 4 ish hours there and that doesn't include the 51 minute movie they have available to watch in the front room
2 hours if you want to take everything it has to offer, read thru and enjoy.
I would allow 2 hours.
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