6+ months of hardcore dedication is a minimum. You do a lot of the WODs as prescribed, or know exactly where you fall in the progression of the movements. You can rattle off your PR's in all the major benchmarks and lifts, and have specific goals to match each one. You program some of your own WODs outside the gym and rarely does an hour pass without you googling a CrossFit article, video, etc. Your friends think your obsessed and/or addicted and they're probably right. Things like CrossFit competitions and CrossFit certifications are starting to creep into your mind if you haven't signed up for one already. You can recite the cues for the Fundamental movements in your sleep and most things outside of CF are seeming to be less important.