My H's EA started in November 05, PA by May 06, living with her a few months later, almost immediately after our S. Things were good to begin with, but I've heard that they've broken up a few times (H and I never even came close to breaking up in 11 years together). I can tell that H is bored of the R and I have confidence that it will end eventually.
As SF said, I also think MLC A's are a different variety compared to your average A and do last longer. It seems pretty common for our S's to move in almost immediately with the OP - not really normal behavior for a real R. It's like their relationship is on speed, which is probably a good thing since it's more likely to burn out faster.
