Actually, the belts, and pullies plus the cover to the timing belt takes quite a bit of time. Also remember you have to compress, and insert a pin in the timing belt tensioner. Every time you undo your timing and reassemble it the risk of a timing belt failure goes up. not every dsmer has removed their power steering and air conditioning, if you think you can do all of that in 20 minutes, then you sir, are a machine. So I would estimate that this saves closer to an hour + worrying about the tensioner failing pre-maturely.
So no, this saves more then 20 minutes
