In my experience there is no answer to your question. Or the answer would be for as many years as you have got symptoms of candida and have been ignoring them. If you have a very mild case of candida or a severe one, it will make the entire difference.
But you are right, there is no way out without the diet - once you are doing good and can stop the treatment (antifungal and cleanses) and keep healthy (symptom free) with the diet only, I would still suggest you keep on the candida diet for a month or 2 before trying to resume to a normal diet. To make it a success.