3-4 minutes? No more, just wave a bill and it self folds! All kidding aside, it it is pretty cool.
I finished making my gimmicks and have been playing with it. You will need two five dollar bills and two ones at a minimum to make the gimmicks and the first ring. You get the extra items required to make the magic happen.
The handling is pretty simple and well motivated. It will take a little practice to do the bonus handling and to break in the gimmick on the ring. Overall, this has the potential to be a real worker. I like Vogt's idea of giving out a bunch of these at your gig to show the customer where you've been and to generate interest.
Glad to hear that you enjoy it. I have also been having a lot of fun with the basic handling. I haven't had a chance to try out the bonus handling, but it looks like it will be equally powerful.