Off for Four days

I am off for four days and there is nothing to do except researching about prevera reviews. So how come I have four days off? I had annual leave on Monday, and my exta shift tonight is cancelled so my next shift will be on Friday for 8 hours. This is the joy of doing long hours. I only need to do 6 12.5 hours shift and one 8.5 hours shift forthnightly. So I have seven days off too every two weeks. By doing this I think I can't do the eight hours normal shifts anymore where you only have 2 days off every week. Jealous? :-)