Tremain Sisters m&g and other characters

How early before The Tremain Sisters’ first meet and greet is recommended to line up and wait? Is arriving at 9:20 for the start time enough? Would we have enough time to meet them at 9:20 and still make it to Gaston at 10:00? I intended to be at his spot 20 minutes early if possible because I know his lines are crazy long. I’m also wondering about Peter Pan at 12:00 noon if standing there 15 min early is enough.