Most of the doors open 2 hours before the show. You can check your ticket or the website of the theater to confirm...
Honestly I'd get there early just in case however I want to around 10pm pending on the level you are on but when I was there walking out it was almost midnight and people were still coming in so best best just call but Novo is in L.A. so I doubt the doors close early.
Most shows end around midnight
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