The ideal kneading time for white bread using a stand mixer is typically 6-8 minutes on medium speed. This develops the gluten properly, resulting in a smooth and elastic dough.
Kneading is crucial for developing gluten, the protein in wheat flour that gives bread its structure and chewiness. When using a stand mixer, the kneading process is more efficient than hand kneading. Start by combining your ingredients according to your recipe. Then, using the dough hook attachment, knead the dough on medium speed (usually speed 2 or 3 on most mixers). After about 6 minutes, check the dough's consistency. It should be smooth, elastic, and slightly tacky to the touch. If the dough is still sticky or tearing easily, continue kneading for another minute or two. Over-kneading can also be a problem, leading to a tough bread, so it's important to monitor the dough closely. The 'windowpane test' is a good way to check if the gluten is sufficiently developed: gently stretch a small piece of dough; if you can stretch it thin enough to see light through it without tearing, it's ready.
Avoid adding extra flour during kneading unless absolutely necessary. Adding too much flour can result in a dry and dense loaf. Instead, lightly grease your hands or the work surface if the dough is too sticky to handle.