When to Switch from OJ to Soup... It depends

How long you drink OJ depends on how long you were on the fast, and what kind of diet you were on before the fast

Accoring the book, " The Master Cleanser "

If you were on the Master-Cleanse for 10 days and you were a meat eater before (regardless if you are not going to be a meat eater in the future) ...

You drink OJ on Day One, OJ on Day Two, until Dinner, where you have your soup. OJ and fruit on Day Three, Fresh Uncooked Veggies and/or a Salad for lunch, and Cooked veggies and a Salad for Dinner.

I might have missed something...

Here is the excerpt from the book:

For People Who Follow a Vegetarian Diet

First and Second Day after Diet:

Several 8-oz. Glasses of fresh orange juice as desired during the day. The orange juice prepares the digestive system to properly digest and assimilate regular food.
Drink it slowly.
If there has been any digestive difficulty prior to or during the change over, extra water may be taken with the orange juice.

Third Day:

Orange juice in the morning. Raw fruit for lunch. Fruit or raw vegetable salad at night. You are now ready to eat normally.

For those who have characteristically lived the unnatural way of meat, milk, refined and devitalized food, it may be best to change over as follows, gradually adopting the raw fruit, nut, and vegetable diet:

For People Who Follow a Meat-Eater Diet

First Day:

Several 8-oz. Glasses of fresh orange juice as desired during the day. The orange juice prepares the digestive system to properly digest and assimilate regular food.
Drink it slowly.
If there has been any digestive difficulty prior to or during the change over, extra water may be taken with the orange juice.

Second Day:

Drink several 8-oz. Glasses of orange juice during the day—with extra water, if needed. Some time during the afternoon, prepare a vegetable soupHave this soup for the evening meal using the broth mostly, although some of the vegetables may be eaten. Rye wafers may be eaten sparingly with the soup, but no bread or crackers.

Third Day:

Drink orange juice in the morning. At noon have some more soup: enough may be made the night before and put in the refrigerator. For the evening meal eat whatever is desired in the from of vegetables, salads, or fruit. No meat, fish, or eggs; no bread, pastries, tea coffee, or milk. Milk is highly mucus-forming and tends to develop toxins throughout the body.
(Milk, being a predigested food, has been known to cause various complications in the stomach and colon, such as cramps and convulsions. The calcium in milk is difficult to assimilate and may cause toxins in the form of rheumatic fever, arthritis, neuritis, and bursitis. The resulting lack of proper digestion and assimilation of the calcium allows it to go into the blood stream in a free form and it is deposited in the tissues, cells, and joints where it can cause intense pain and suffering.)

Fourth Day:

Normal eating may be resumed, but best health will be retained if the morning meal consists of our type of lemonade or fruit juice: and, of course, if a strictly fruit, vegetable, seed and berry diet is followed. If, after eating is resumed, distress or gas occurs, it is suggested that the Lemonade Diet be continued for several more days until the system is ready for food.