Cabbage leaves are amazing to help dry up milk. Make sure they are green though because red doesn't seem to have the same effect and I'm not sure why.
I've heard that cabbage leaves have been used to relieve engorgement. Once you break them up so there are no hard veins in them, place them in your bra for a couple of hours or until they wilt. Arrange them so they are comfortable and there are no hard spots pressing against your breast. One of my cousins did this after the birth of her daughter!
I stopped nursing at the end of march and I still have milk.
It varies from person to person but can take up to several weeks for it to dry up completely. Remember that something as simple as the water hitting your breasts during a shower can stimulate them. Also, our bodies are wired so that when we see our baby or hear our baby cry it triggers the let down reflex and can cause leakage.
Its only been a week, usually the minimum time (that I've heard) it taking for your milk to dry up is 2 weeks (and that is really fast). Of course you're really not supposed to touch your boobs at all or even take warm showers to help 'dry up'. Idk about you but I couldn't imagine not using it if I had it, not all women get that lucky. (Personally I'm going to donate my pumped milk, they use it for preemies and sick babies whose mothers can't produce enough milk. It really does save lives.)
It depends on your body, there are women who will leak several months after weaning and even a few reported cases of 'older' women still having milk when their grandchildren are born!! Of course I don't expect you to be like that... I give it 2-3 months to completely dry.
But if you start to run a fever or notice a hot and painful lump in your breast go to your doctor. You can get serious infections if the milk gets 'backed up' and blocks up your ducts. The 'normal' treatment for it (mastitis) is antibiotics and LOTS of nursing... (to unclog the duct) but I dunno about women who aren't nursing...