It’s been established that by the beginning of story year 2006, about a year has passed since the coming of the Toa Mata. BS01 says that 2001 spanned a month, but that seems a bit short to me, and I’m not sure where they got that info. It’s always been unclear how much time each story arc in 2001-2003 took exactly, although it’s believable that 2002 and the Bohrok-Kal saga each took a month.
FWIW, I’d have to double check, but I believe 2006 spanned a few weeks, 2007 was definitely only three days, and 2008 probably took a week or so. But don’t quote me on that; again, it’s always been a bit vague.
Also, someone asked something similar here: Why does everything take as long as it does?