The computer will let them book you 180 days from your FIRST day onsite, and you are also allowed to book all the days AFTER that, which of course IS more than 180.
SOOO...if you are staying 10 days, in essence you are booking 190 days out from the LAST day of your vaca. That is what people are referring to.
TRUST ME...I know...I tried to book on what I THOUGHT was 180 days, but I was 2 days early! No way, Jose! AND WPC you have to wait...that was the one booking I could NOT book until exactly 180 days out (it is our 6th day at WDW, so I had to wait 6 more days to call in for that one! Go figure!)
I think the way some posters have presented it, it can be easily misunderstood.