The womens match racers sail in a round robin, their round is assigned to a part of the day they will sail during. During the final rounds they will be around more of the day as they advance through the finals. They also rotate in and out of boats. So they aren't sailing all day.
Some of the women's teams will be at Sandbar pretty late if they aren't sailing in the morning.
That and there is no womens match racing anymore.