I've only heard the many critics that live in the alternative world. I certainly haven't heard any of his patients.
It took about 3 days for the "scab" to form. Then, I can't remember how long it took for the scab to wear off. I did not do this several times a day; as the doctor says to do; but, mine are considered "pre-cancer". I think they are quite common among people who stay in the sun a lot. I've used the Lugol's solution and the toxic drug store variety with success once or twice a day.
I've since used the MMS protocol (see the MMS forum on CZ). I no longer have any such skin problem. Unfortunately, still have the sinus and constipation problem. I think it will take a while.