An hour might be too short for marvel with both Antman and avengers 2. Of course Antman may only be like 10 minutes depending on if they have any footage.
Ant-Man is most likely not filming yet (Michael Douglas said You are not allowed to view links.
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Login), so I doubt whatever they do will be all that long. Either way, Marvel managed to make Thor: The Dark World, Winter Soldier, Guardians of the Galaxy, and the brief Age of Ultron tease fit into an hour last year, so Age of Ultron, Ant-Man, and any Doctor Strange/Phase 3 announcements should be a piece of cake.