Well last year this is how it went for me:
Saturday night- contest pre-meet, it took a while but there were bros everywhere.
Sunday morning- Walk-on practice, about 20 minutes to half an hour
Sunday afternoon- Costume judging
Sunday late afternoon/evening- dat contest
So it took up Sunday, but I still had several hour-long breaks between everything. The judging time depends on what time they assign you, and Haley and I got to everything at least 20 minutes early or so because we were paranoid.