I don't know how long it takes to clear up but you have to
A. Take the whole prescription
B. Eat healthier and avoid some foods helps as well
Cleanse the body of toxins with a liquid diet of fresh, raw vegetable and fruit juices including carrot, spinach and apple juice for three to seven days. Strengthen the immune system by eating plenty of raw, fresh foods and avoiding red meat, saturated fats, fried or refined foods, and caffeine. If antibiotics have been administered, take plain, unsweetened yogurt or kefir to replenish friendly bacteria which are destroyed by drugs. Garlic should be added for its natural antibiotic activity.