Rosters is issued 15 days by 15 days and announced one or two days before they apply.**They are of course subject to constant changes and the biggest issue is that you cannot plan on the days you'll be at home, especially if you commute.**Forget to meet appointments with your dentist, car repair etc. unless they take you last minute.**Your wife and kids are also better be prepared to adapt to a last minute style of living.**We witnessed the case of a colleague who missed the birth of his baby while the baby came exactly on time known for months.**This "missing" was caused by a bad mood scheduler who just enjoyed his power of playing/fooling with the poor pilot's most important things in life...