To drastically lower your cholesterol down to it's normal levels it can take a few weeks to a month depending on your diet and lifestyle.
You can almost always get your cholesterol levels down within a few weeks to a month without any prescription medicines by changing your diet and avoiding foods high in cholesterol.
Green Tea and Cranberry Juice are both good drinks to help lower your cholesterol levels overtime.
Sometimes you might need prescription medicines to lower your cholesterol levels if the other natural remedies do not work good enough.
So if you do not see your cholesterol levels go down within a few weeks to a month then I would speak with your doctor about getting the cholesterol levels down.