It was a couple of weeks. I used to own a Ruger MKII Stainless government slab side pistol. Great .22, I could hit a nickel every time at 25 yards. I had it completely apart a couple of times, and it is a really difficult gun. My G17 is really really easy. I used a video on youtube to take it apart, but once it was apart, I decided that I really didn't need the video, because it is such a simple mechanism.