I don't usually make "quilt sized quilts" - mine are not generally bigger than 60x60 because they become too cumbersome to quilt on my machine.
I quilt for about 4-5 hours a day, and usually make about 3-4 a month. I start one and will finish it (except the binding). Then I pick a day and will bind about 10 of them at once!
Sometimes, weather depending, I can make 6 in a month!
I can usually do 40-50 quilts a year, and I donate all of them in late November so they have something for Christmas to hand out.