This one can easily be made in less than an hour. For the assembly video below it took about 40 minutes, and I was taking my time to make sure and explain everything and get it right. So 30 minutes would be possible even for a first time build.
Here is a PDF of the Instructable that includes all the secondary images and annotations.
Here is a video explaining the assembly
It isn't really demonstrated much in action in that video, but it is pretty much the same as the original card in function.
Step 1: Tools and Supplies
Cardstock (the thicker the better, I use 0.012" thick and wouldn't suggest anything below that)
Stapler with staples
Small rubber band
Step 2: Print out the pattern
Make sure the page is not being scaled when you print it if you want business card size parts.
The pattern used for the one I built in this Instrucable had a dashed line on the upper arm. I've removed that for clarification that nothing needs to be cut there.
quick.pdf is just the normal pattern and quickfilled.pdf has all the scrap pieces filled in with a gray color to make it easy to identify which parts you don't need.
Since Instructables now requires a Pro account to download files, I've uploaded them to my site so you can still download them for free. Download here