When we went in June last year, it was from 9am till 10pm. In planning for such a trip, I would give Universal Studios Customer Service a call.
9am
As far as i can see on their calendar for the month of April was all 9 am.... can't find a calendar for June yet. It would probably be safe to assume June would ne 9 am also. Hopefully this helps.
9 to 10/11 you can get the app its free
9am until 9pm
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