The movie is just about 1 minute. It was recorded at 640x480 with a frame rate I'd guess at around 30 frames per second. The resulting file was about 11.5 MB in .wmv format. When that was done I uploaded it to YouTube. I do have a good connection in the office and certainly at school network traffic is lower now that we're in summer session. Your mileage may vary. But the putting in the meta data, the upload, and processing took 7 minutes. Then it spit out the html to embed the video in the blog. It took another 3 minutes for the video to actually be available. From my point of view that's not too bad. Of course, I've done quite a few of these so more or less know what to do. A student doing it for the first time would have a harder time. But my guess is that they'd figure it out quickly --- the skill has alternative uses beyond the class so should be valued.
The only real issue I can see with this is if English is not the first language or the student has some disability that makes speaking difficult. Otherwise, I'd do this if I were teaching now.