It took a couple of months before my milk completely dried up after weaning. (I wore breast pads for probably a month afterwards because of the leakage.) Our lactation consultant recommended placing cabbage leaves in my bra (apparently there is estrogen in the cabbage that is absorbed through the skin.) She also recommended drinking sage tea (you will probably have to go to a health food store to find it.) Both seemed to help. Cold compresses can also help. If you are desperate, you can try a decongestant like Sudafed (you have to purchase it behind the pharmacy counter now).
If your breast gets full and uncomfortable (engorged) you may want to pump just enough to relieve it...but not enough to stimulate more production. The last thing you need is clogged ducts or mastitis.
Hope that helps.