Our Caterpillar began his transformation sometime early on Sunday July 3. As you can see at the beginning of this video it hangs in the shape of a "J" for several hours preparing to become a Chrysalis. (FYI a butterfly forms a Chrysalis, a Moth forms a Cocoon. Many people confuse the two terms.)
This Video is about 3 hours of time lapse compressed to about 30 seconds with the finale being the finished Chrysalis. As you can see once it begins to spin the Chrysalis it doesn't take long.