work on a cruise ship

I sent in an application to Steiner. They are a company that hires for spa positions on most major cruise lines. I got an email yesterday offering different dates and cities to have an interview. I sent in my preferred date and place. They will be contacting me in a few weeks with more details. I am very excited about this prospect. I have a lot of student loans and not having to pay rent, utilities and all that will help a ton. I have been reading a lot online that makes me a little nervouse though. I understand I will be working long hours, but I read somewhere that you work 7 days a week. Do you really not get any sort of day off? anyone work in the spa on a cruise ship? I’d love to hear some first hand experience.