Our hives, while they use side entrances, have 6 7/8" entry holes. 2 toward one end, 2 centered, and 2 toward the other end. This way you can start the bees in either end or in the center depending on your preference.
There is alot of answers to this question....its what fits your needs. What are you putting in the TBH???..Package bees, Nuc or a Swarm???
Is your sides on an angle or straight up and down???? Do you have follower boards or you gonna use all the space???? There will be plenty of ideas and they will all work but what will suit your needs is the question?
Photo of my top bar hive is on my profile, i frilled two holes on one side, one down at one end and the other hole down close to the other end, on the other side i drilled 3 holes close to the center right below the observation window. I have corks in them until its full of bees, then i will open them up. I have a follower board in mine. (My preference)...I add a few bars once they start getting close to the follower.
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