Arthur Cleans Up - A Guessing Game

This morning while I was nursing the girls Arthur emptied all of his toys into the floor.  This is the second day in a row that he has done this.  Today I told him that he would not be coming out of his room until he put his toys away.  Any guesses on when he'll finish?  

Hint 1: He ate a protein bar around 7:30am.

Hint 2: Yaya will be here around 4:00.

Disclaimer: He is allowed to leave to go to the bathroom.