You might want to post this in the regional forum also to get more accurate data as it pertains to airline pilots in general. There are several regionals where 5 or 6 days on and 2 days off is the norm. At my airline, we routinely switch from AM to PM to AM, sometimes 8-12 times a month. That is the biggest culprit of fatigue for us. Many of us just don't sleep very well at all anymore.