Not the person you replied to, but took about 6 months for me the first time. After being "poisoned" by gluten a couple of times over the years, I tend to have

Not the person you replied to, but took about 6 months for me the first time. After being "poisoned" by gluten a couple of times over the years, I tend to have symptoms for a month and then all gone within two. I am in the group who gets dermatitis rather than digestive symptoms though (though I also discovered in the process that onions give me the latter so I cut them out too!)