Now add your softened butter. Increase speed to 2 or 3 and beat for 10-15 minutes more until the dough begins to pull away from sides of the bowl. Let it run for a couple minutes more and after that your dough is ready. If you are kneading using your hands, after adding butter, the dough will get very gooey and messy. Cover it and let it rest for about 15 minutes. After that it will be in a much better state to continue kneading. Your dough should be soft and slightly sticky. Transfer to a well-oiled bowl, cover and place it in a very warm place to rise for an hour.