If you have enough vacation time, go for a week. It says you're in Indiana, so you'd have to fly down on Day 1, check in (which can take an hour or two), then you have two full days on board or in port, then you check out before 9am and fly home on Day 4. Just as you're starting to enjoy yourself and get used to the ship you'd be checking out.
The cost per day is huge, especially when you factor in the flights.