My bet is somewhere in the middle: 15-20 minutes at the end of the show (3 minute trailer + 12-15 minute gameplay systems overview), followed by a one more thing cgi teaser of another game.The real question is…
Starfield showcase is it will be 3/4 min and call it a day or it will be lengthy one as we all know BGS with fallout 4 & Fallout 76 30-40 minutes .
My best scenario is Starfield will hold 30 minutes as last game will close the show with Todd Howard
You have to keep in mind that the FO4 demo has a lot of talking to the audience, pauses for applause, stuff like that. It would be pretty easy to shorten it a little for a showcase without a live audience.