About 6-7 months. I learned how to solve the cube about a year ago, then got serious about it when Christmas came around so yea. PB Ao5 is around 16, Mo3 is around 14, and Ao12 is around 17 or 16. I don't remember. But these days, when I get a chance to cube, in a session where I actually try to get good times, I get usually mid to high 19's Ao12. I haven't practiced in a while mostly because of marching band and my job. If I hardcore practiced everyday, and did about 300-500 solves a day, I would easily be sub-17.