June will be very hot. Also because of it being popular season, there will likely be long lines. So it may take more than one day if you want to do everything. So I'd definitely suggestgetting the express pass.
Lines will be long approximately 1 hour long per attraction if not longer. Arrive once the open and plan to stay until closing. Also if you don't mind riding alone use the single rider line and that drastically cuts down on your wait time.
Universal Studios Hollywood isn't a very large theme park. June is peak season so it will be crowded. However, during the summer the park closes late. So youll have plenty of time to enjoy your day.
Its always crowded i guess. But yes, you can finished it one whole day. Come early take express pass. :)
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