Wedding Timeline Advice?

My wedding is coming up very soon, and I recently found out my hair and makeup team is planning to be done an hour earlier than they originally said. When I first asked for a time estimate, they said it would take 4-5 hours, so I planned for 5 to be on the safe side, and I confirmed this with the makeup artist who did my trial (the hair and makeup team are from the same salon and she said that some hairstylists take about 45 minutes per person, but the one assigned to my wedding usually takes right around 60 minutes per person so 5 hours would be right on track). However, when the team confirmed my payment, they said it would only take 4 hours, and that the hairstylist only takes about 45 minutes per person, especially if no one has super long hair (they don't). Did anyone else have this awkward gap of time? Is this down time that I'll appreciate having or should I try to ask the hair and makeup people to come a little later in the morning? Did anyone else have extra time and what did you do during it?