Firstly, know that you can highlight as many of the links as you wish (yes, even ALL OF THEM....if you ordered them all) and then start your download and they will all download at once instead of taking up your whole life downloading one at a time.
It will take your video as long to download as it takes. Really. It depends on which video you are downloading, your download speed etc. If you are using standard DSL (which downloads at 256 kbs) then it will take on average of "real time". This means that if you are trying to download one of my 2 hour long videos that it will take about 2 hours to download. Can you speed up this process? Only if you upgrade your service. Cable and better service download speeds will download the videos in a few minutes. And you thought DSL was fast? Not in today's world.
So, if you have dial up service only....don't order the downloads. You'll never get them downloaded. You could possibly get the drum tracks or other backing tracks downloaded, but a whole video....not likely.