It really depends on the CM you get. Some will only consider the fact that the restaurant has opened for ressies that day and will book for whatever. Others will make sure that you are at the correct 180 mark.
I know it can be totally confusing. So for example, I calledd at my 180 mark and made 10 days of ressies. We're booked at the Poly for 3 weeks but may shorten our trip to 2, either way we could not book all of our ressies at the 180 mark. When I was done with the ten the VERY helpful CM asked me what my 11th day ressie request was and I told her Le Cellier. She said, sometimes they open up the restaurants for ressies before anyone realizes it. She check for me and she said it was open! We checked for days 12 and 13 but no luck. Essentially what I am getting at is that if the restaurant is open for that date, some CMs will book it regardless. I guess I could have tried this from day one but I didn't.