I've used both 2 ozs of lemon juice and 4 oz of lemon juice and have the same results with both. It's easier to drink less, but more won't hurt anything.
On the day of the flush, I like to eat dinner about 5:00 pm.
I drink the lemon and olive oil mixture about 7:30 PM.
I drink the magnesium citrate about 9:30 PM.
The amount of juice you can get out of a lemon makes a difference in how many it takes. I can get 2 oz. out of 2 to 3 lemons usually.
I'm glad you decided to try this method. Let us know how it works for you and if you like it or not.