moms who have quit breastfeeding please answer!

I quit breastfeeding a week ago and there are still hard spots in my breasts filled with milk. I was expressing a little milk out by hand every 12 hours but it doesn't seem to make any difference either good or bad. My breasts don't hurt as much as they did when I first quit but they are still hard and full. How much longer until they don't feel hard anymore? And should I stop expressing milk altogether? Thanks so much for any help!