I was just there two weeks ago if you read every little detail like I did LOL you could be there 5 hours but you can get through it in about 3 1/2 -4 hours.
4-5 hours if you want to read and learn about everything
2 hours if you're in a time pinch, 4 hours if you want to see everything in detail
About a couple or three hours. The entire Edison and Ford Estate can be seen in depth in about 3.5 to 4hrs. Also would recommend to download the app. Purely depends on how long you can stay on your feet or deal with heat in Florida. We had two kids and a very humid day and could only handle 2.5 maybe less hours.
I would say 2-3 hours, it's a pretty small museum.
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