x 2. I heart shift work like this, and will be doing it again soon. I periodically do it now, but it will be permament soon.
7 days off in a row kicks serious ass (you only have 4, but still).
You learn to regulate your body, or your body learns. I get a good 6 to 7 hrs on gravys...after staying up the first 24 hours.
8hr x 5 sucks...wtf can you do with just 2 days a week? having 7 off at a time, or 4 in your case, is awesome.