[mykalberta]

Normal jobs you acure X number of hours of vacation for number of days worked.

Figure out how many hours you have available to use then use them. It is a bit strange taking the vacation in the middle of the work days and not attaching them to the weekends in some fashion - I assume that is where the problem lies.

As others have said, you work a non-normal schedule so standard rules wouldnt apply to your situation. Its possible they have a rule for vacations etc. Ask your HR person, they are "supposed" to be confidential, just asking them what the deal is isnt going over someones head. Or better yet, ask your boss what he was thinking, and dont assume what he is thinking.