Go ahead and buy the big bottle.
The FIRST time I bought the 11 oz bottle for my duaghter because she had a cluster of warts. We used it about five times a week because life is busy and i didn’t always remember. Once the bottle was gone, her warts remained. The company was so great about giving a refund. However, a few weeks went by and all her warts had disappeared. I can’t think of any reason that might have happened except that the oils were still doing their thing after we stopped. I thought I’d give it another try when my other kids had warts. So, the SECOND time I bought the 11 oz bottle, I was using it for two large patches of warts on my two other daughters and a few warts on my son. Since my son had the smallest amount of warts, I only applied it ~10 times sporadically. I don’t know if it was because he had the youngest skin but his went away completely. We finished the bottle on my two other daughters and the younger one (younger skin), had her warts disappear completely. I am now ordering for the THIRD time because by now, I know the product is going to work, I just need more of it. Moral of the story, get the 33 oz because it’ll work. I recommend it to everyone.