MH 108
I suggest the 14 day fast of BOOK I, or better yet 21 days. They used no herbs. For herb use, I suggest the 108 page booklet.
If you have not read those 2 books, then your asking the wrong questions, because the first answer is read those 2 sources before you attempt an orange juice fast.
If you have local oranges, then I suggest a 2 month fast each year of nothing but fresh oranges.
MH