How many chapters of a memoir on sub?

In that a memoir is somewhere between a fiction sub and a nonfiction sub (as form not as fact versus fiction) how much is the "right" amount for agents to send to publishers on submission?

Other than "it depends" I'm curious what people who have sold a memoir in the last year or two have found to work best....two or three chapters, half the book or the whole book?

With my agents we've tried just two chapters and we're about to go out again with 5 (100 pages of MS).

Any thoughts?

It's been a question my agent and I have gone back and forth about and he's not sure either. It seems it used to easier to send less and now more is demanded in every way. So it seemed worthwhile to see what others had done recently. That's all.

He's a hugely successful agent but the point is that in the area of memoir it's not a fixed issue i.e. how much to submit. Any other thoughts on the matter?