Depends on your stamina, whether you have children with you, how crowded it is and what you want to see. Diffidently start before 10 and follow the previous suggestion of going to the barns first. The state houses are crowded most of the day. They open at 10am which is a good time to go and another review said 5pm-ish is also good for less people. They have an app that tells you what time events take place. There's a parade at 5pm every day. We went early and had. Breakfast across the street at Memo's and went into the fair about 9:30 and we're there until 5pm. I'm a New Englander now living in Jersey so it was a homecoming for me. If you have no nostalgic connection, you can do it in 5 hours if you have a game plan. Enjoy!
No ! If you plan it well and hit all the New England State Buildings as well as the International and Better living buildings That would fill all of the 5 hours. You would not be able to taste the many and various foods , ride the Midway with kids or take in any entertainment or sites in the Town common. You would miss a lot but if I had 5 hours I would spend it the way I have described. Next year I'm going for 2 days!
I get there for 8 am when the gates open we check out all the animal activities in the barns. The building start to open up about 9:30 and the main building open at 10. By 12 or 1 we are done and on our way home. Plan on walking about 3 to 6 miles that day, the do offer scooters and carriages for kids
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