The clogs pattern is not well suited to adjusting for machine knitting. In the internet world of free machine knit slipper patterns, there are 4 common ones. The first is just a rectangle, stitched up the back heel and top of the toe and I think felted. The second pattern is "7 Minute Slippers" and the third is "14 minute Slippers". I had put off making these two because I couldn't find pictures. Once some got posted in the Yahoo groups and on Ravelry, I decided to go for it. After finding out the 14 minute slippers are just the 7 minute slippers with lining knit as you go, I figured I'll give them a try first. My feet get cold!
The pattern was easy to follow, and very quick, although not 14 minutes. And there was insufficient gauge info. Most people finish the top with a pompom or something to hide the hole, but I thought it was kinda cute.
The fourth most common machine knit slipper pattern is the "Double Thick" slippers, aka "Romeo" slippers or pixie slippers. A little more involved, these ones still have the lining knit in as you go, but they also get put together with "seam as you go", a technique pretty much unique to machine knitting.
I timed the last slipper, and it took 45 minutes from start to finish, for one slipper. I went to a craft sale on Saturday, and people were selling mittens and slippers and socks (cheap acrylic yarns) for $3.50-$4.50 a pair. To make a pair of these for lady's size 9, took a little over one ball of Patons Decor, which can be bought for about $5 (true, these slippers are two layers though). I'm planning to write a post about the issues related to craft sale pricing. Even if you don't sell at sales, it still affects you, especially if you give knitted gifts.