To write all seven volumes? Probably more than a year, seeing as I'm also going to be working on my novel series as the main focus. The Chronology will be my side-project, whenever I get stuck or my muse won't cooperate with Scourge of Yggdra.
I also have well over 100 characters to develop before I write the story, even if I do it in stages. It will take a while, but I will be providing bits of my progress for you guys to read. ^^