The Moorings brochure is usually pretty accurate, so if they say it takes 5-6 hours from base to Leverick Bay, that's a good estimate to go by. It might seem like a lot for the first day, especially considering you want to explore the Baths, do the Kodiak Queen dive, and possibly stop at Savannah Bay before hitting the jumbie show BBQ at Leverick Bay. Having a captain is a big plus; they can provide valuable input on timing and logistics to make sure you enjoy each spot without feeling rushed. Maybe check in with them to see what's feasible so you can make the most of your day. Safe travels and enjoy every moment!