Oppenheimer was a little too long, even for the biography genre. You are expected to know the real story of what happened to Oppenheimer before going into the theatre. A little heads up in advance would have been nice, even for me (I knew the story of Oppenheimer beforehand). For people who want to watch it, the story has another hour left after the Trinity Test. Hopefully that’s not a spoiler. But do be prepared to think would have been nice if it concluded sooner. Acting was incredible, nothing to deny there. Every single person acted amazing, especially RDJ. It has no thrilling sequences, 100% biographical. It’s just people talking to each other. So, unless you are a movie buff like me, you might not like it.