It can take as long as 6-18 months to fully recover from candida overgrowth. Everyone has a different timeline for recovery and a few people have been cured within a few months. Over people have been on the diet for 6+ months but are more or less symptom free. It varies widely. I would put no timeline on the diet.
Are you doing the forum’s cleanse or the cleanse on the website with psyllium husks and clay? The psyllium isn’t recommended because it can cause internal bleeding.