Depends on how in depth you want to check out the various exhibits. Maybe 30 minutes-1 hour without stopping at the trucks for too long.
It will take you a very hours if you want to do it justice. Great displays of fire equipment from person pulled to horse pulled up to first responder to 911.
There is a huge selection of displays. Besides firetrucks there are displays on patches, a 9/11 memorial, another memorial of fallen firefighters, an area for kids to learn fire safety and a working dispatch system from Phoenix. There are also walking guide books that give more information. If you just want to look at the trucks 30-45 minutes. But, if you want to check the cool history of all the displays, give it at least 90 minutes.
30-45 minutes if you just want to walk and look.
Not long. There is a guide, but you xan just go without. Maybe 30 mins
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