There are 22 frames in this
tutorial. It lasts about 15 to 20 minutes
depending on the amount of time you spend on the interactive frames.
If it seems to get stuck for more than 15 seconds, click on
the number in the upper left corner to force it to advance.
If you want to go quickly to any portion of the tutorial, click on the
blue arrow buttons at the top to move back and forth by concept.