Never set the washing time for over 10 minutes — most detergents have done all the work they are going to do by then– the rest of the time your clothes are just agitating in the dirty water.
It may not seem like much, but you can save a quite a bit of money over time using this trick.
Water temperature plays a key role in the washing process. Hot water offers the quickest, best form of cleaning, and should be used for the following items: Sturdy whites, colorfast pastels and light prints, cloth diapers and similar baby items, and heavily soiled clothes. Warm water removes wear wrinkles, helps reduce wrinkling in the washer, and minimizes dye loss. It should be used for permanent press, all colorfast dark or bright colors, nylon synthetics, polyester, acrylic and washable woolens. You may want to keep in mind that laundry detergents are formulated to clean best at temperatures above 60°F/16°C. Cold water may prevent sensitive dyes from “bleeding” minimizes washer wrinkling and saves hot water. It can be used for lightly soiled fabrics, and should be used to rinse all loads, regardless of wash temperature. However, due to detergent formulations, cold water does not clean as effectively as warmer temperatures.