Ocean Village 1 uses Barbados as the terminal to its cruise this year. A 2 week cruise gives a full day ashore but a 7 day one only gives you a brief visit.
Try the freephone number at the top of this page, they will give you all the information you require. On doing a quick search, I cannot find any cruises out of Barbados of less than 7 nights, all the shorter ones seem to depart from the Florida ports. By taking a shorter cruise, it does not necessarily mean that you will have less time ashore, just that you will visit fewer ports.