94 years, realm size 363, formed the Fylkirate and win every war without trying. I did benefit a bit from vassals using the invasion CB, but it doesn't account for that many of my holdings, so I don't think changing that alone will change much. This particular game has to be abandoned, but is there anything I can do to turn up the challenge level for the future?
(I'm worried I've gotten too good at CK2 in general. And yes, starting as a count makes the climb to the top take longer, but it doesn't make it that much harder to hold said top position.)