6 months. I snapped hard. It hurt and I am still going through periods of anger and frustration 1.5 years later. I am still tapped into Mormon news, podcasts, etc but I am considering cutting it all out for my sanity/progress.
I stared to question things a couple years prior to my faith crisis, but I shoved them down and suppressed them. I feel like everything I had suppressed surfaced at once, and I was out immediately. Transitioning out was fairly quick for me.
I struggled most of my childhood, starting when I was learning about baptism. Over the years, my shelf got heavier and heavier until it finally broke. I struggled so much and I dealt with so much fear and anxiety. The struggle is worth it once you're out.
The initial struggle with nine months, from April 2015 to the end of December 2015. But even now, I struggle with many aspects of Mormonism, these years later. I still stay abreast of the current policies and teachings, I'm following many post Mormonism podcasts, I am active in a number of different exmormon groups and forums, and I am in a mixed-faith marriage. So the struggle really isn't over, as much as it has just subsided.
Off and on for ten years or more. I put lots on my shelf over the years.