HI! I hope I am explaining this correctly. 180 plus 10 means you can make ADRS 180 days from the start of your first ADR date and 10 days after that. For example we are going to be at WDW August 14th-August 23 so on February 15th I was able to make my ADRS for my whole trip, 10 days long. You used to have to call for each day of your trip separately if you wanted it to be exactly at the 180 day mark. The only restaurants that they may tell you you have to wait until it is exactly 180 days are those not owned by Disney, I believe. For example, I wanted Planet Hollywood and had to call back on February 18 because that was my 180 day mark.
I hope I made sense. I am sure someone else will post and say it clearer and simpler for you. Congrats on your wedding. Have a super trip!!