I ordered A Game of Thrones and A Clash of Kings from Amazon on 29 October 2006. I must have started reading them within a few days and decided to keep on going as I ordered the remainder of the series then in print on 15th November 2006 and read straight through to the end of A Feast for Crows. So when my preordered copy of A Dance With Dragons comes in mid July it’ll be about four and a half years since I finished my first read-through of the previous volumes.
I’ll have to read them all again first.