When a boil comes, reduce the flame to low and cook for another 12-14 minutes. Keep it stirring at regular intervals to avoid any lumps or burns. The batter will looks more shiny and thick in 12-13 minutes, then switch off the flame. (Time may vary as per the quality of ingredients, type of pan and intensity of heat, so keep it stirring and check when batter looks shiny and starts leaving the spatula or pan, its done.)