In the Hannah Montana the movie ds game how long do you have to stay inside after travis finds out miley is Hannah

Umm... the question does not make sense but I will give possible answers:
after you preform the last song You'll Always Find Your Way Back Home and you are back in the house and the door is shut it means you completed the game

When Miley is going across the street as Miley and Hannah after Travis finds out about Miley is in her room back home and you have to change into different clothes, then you have to go back down stairs out the door and find Robby Ray outside in the gazebo which is on the left side of the barn just follow that little trail, you talk to Robby Ray.