https://wccftech.com/star-wars-battlefront-ii-campaign/

Star Wars Battlefront II is now very close to release, and PC and Xbox One owners can get a taste of the full experience through the trial that’s available on EA and Origin Access. Among the players with access to the trial, there is one that has managed to play the full single player campaign due to some error.

Reddit user CiaranG99 has managed to play through the whole Star Wars Battlefront II single player campaign, confirming some interesting details. Just like revealed by members of the team, the campaign takes around 6 hours to complete on Normal difficulty. The reward for completing missions are crates.