I think the first question is - do you want D for more time, or do you really want a break and therefore something closer to 50/50 time over vacation?
If you want to/would like to have D for more time (and this is more about the principle of it or what's "supposed" to happen), why not just say OK?
If you need a break/you have already agreed to 50% shared time on holidays, you could say something like "Thank you for your suggestions, I'm glad we can talk about this together. I really need some more time without D during those two weeks to get some things done. If I will take her the 23, 27, and 29, that leaves me two more nights to take her - perhaps the 28 and X would make the most sense so they're back to back. That would leave you with [these five nights]." He mentioned he thought you were taking her for an extended period.. not sure what that's about. Have you said things that indicated you wanted her for more time or more than 50%? Or perhaps, have not complained much in the past when you've taken her for more time (like the Thanksgiving you mention?)
I guess I'm still confused (and maybe I just don't get it because I don't have kids and haven't gone through this) about the purpose of the mediation if no dates were set and none of it matters, anyway. I think you had expressed frustration in the past about not having a more set schedule...but it also seems like you would like some flexibility. It seems like it's hard to have it both ways, so what matters most to you? I feel like if I were in that situation and someone told me "we need to follow a schedule and get it set" and then said "but I would like this day changed," it would totally leave the door open for me to suggest changes of my own, too, because that means it's not really set, just a suggested schedule.
Me:30 H:29, no kids T:12, M:4 (when D was final) 12/13: "Don't think I want to be M anymore" 6/14: Separated (I move) 1/15: H filed for D 5/15: D final
