i cant remember how long, but i stopped for the whole summer and didnt even think about it, my reason for stopping was because i ate on the road fruits and vegs for work. then i realized the white stuff was gone cause in the mornign if its there it dries and makes dead skin, and that problem was gone. so i tested it, ate sandwiches, and it came back. I have to admit now i do eat pizza and grilled cheese every now and then and it comes back but hardly, and i did notice eating bread makes my lips red and inflammed the following days.
try it out, you have nothing to loose, only to gain.