Create itinerary with time and duration values. Seeking correct formula to add them

Greetings all… I’m thinking #uncategorized might be a good place for this inquiry. Hope so! I’m seeking some google sheets help. I am creating an itinerary and want to add two different time related values. Interested? Think you could help? Here’s the page link with details. Would love any wisdom you can share. https://docs.google.com/spreadsheets/d/1wyKCdGzRmoWlkpl-WlRkBi4EDbfSoUB0x6PHZXsYv8M/edit?usp=sharing