Wayne, I have never seen a recipe call for more than 15 minutes kneading total (hand or machine) and most recipes call for half that amount. (5-7 minutes is standard in most bread recipes, both from professional and amateur cookbooks) Given this, it makes no sense that this Sunbeam would require 15 minutes on top of whatever time it takes to knead in the first place, unless the machine is somehow magically unkneading the dough. Assuming the machine works like a standard stand mixer (with the dough hook), I would simply ignore the instructions and do what you normally do. A little hand kneading at the end is useful, but not for more than a minute, if even that.
"I was looking at kitchenaids yesterday £300, so that is over $600 Australian dollars, and around $500 US. Ouch! I am stuck with handkneading for the time being. I am in search of a secondhand Kenwood. I know they are noisy (I remember mum using hers during Saturday afternoon movies, not only did the noise drown in it out, but the picture got disrupted by the darned thing)"
I purchased a 300W 4 quart Kitchenaid stand mixer for $350.00 CA (about $460.00 U.S.) from Williams Sonoma, and it is by far the best investment I have made for my kitchen. It is easily the most useful tool in my kitchen for everything from creaming large chunks of butter to whipping meringue, to kneading dough. It may seem like a steep price, but it is so indispensable, that you will wonder how you lived without it. You should really consider biting the bullet and just buying it; you won't be sorry. I can't comment on the cheaper models, but honestly, for something as fundamental as a stand mixer, I would not be counting pennies and looking for a bargain. Everyone I have ever spoken with agrees that Kitchenaids are supreme.