Half day reservations

We are developing a website with a boat charter reservation system. We need clients to be able to reserve a half day, a full day, or several days. it’s possible?. Testing with the possibilities that your plugin gives us, the only option that I see possible would be to add an extra half day option that will subtract the corresponding amount, but when more than one day is selected, that possibility should disappear. it’s possible?

Thank you! and sorry for my english.

The page I need help with: [log in to see the link]