I dunno, but I guess the "Recent Conquest" should always last the same, as, atleast to me, it represents the general destruction caused by sieges and occupation, and after all, no matter by whom the peasants are ruled, they will try their hardest to rebuild their homes; no matter whether it's visigotic catholics conquered by Lombard Fraticcelis, or by Sunni Andalusians, the destruction will be pretty much the same, while the "New Administration" period should be variable, as after all, it would take relatively short time for Saxon Catholics to get used to being ruled by Bavarian Catholics, and to start trusting them, while the Visigothic Catholics would harbour grudges for the Sunni Andalusians for quite a long while, both for the extreme cultural differences, and religious differences