I mean they practically can become that if you include the networking events and dinners but the listed hours in the exhibition hall usually are closer to 8 hours.

Ew, no. That's horrible. The company I work for does a lot of shows. I generally do about 22/year. A common range is 9am to 5pm, but 10am to 4pm is not unheard of. 8am to 6pm happens from time to time and feels really bad. I think out of 60ish shows that I've done only one was 7am to 7pm.