Usually Flounders is open for some hours during the day that correspond with certain excursions and for a few afternoon hours during at sea days. At night, they are open 6 - 12. There is a two hour minimum requirement, and a maximum amount of spaces you can immediately ask for, on our 4 day we were only able to request 3 Flounders times at the original sign up time. If additional spaces were available, we could have signed up for them later.