Yes, shorter showers can help the environment by reducing water and energy usage. For example, a 10-minute shower uses about 18 gallons of water, while a standard showerhead uses about 2.5 gallons per minute.
If you shorten your shower by one minute, you could save 900 gallons of water per year. The United Nations Foundation says that limiting your showers to five minutes for one year could save as much carbon emissions as is sequestered annually by half an acre of U.S. forest. And use environmentally friendly bar soap wrapped in paper rather than plastic.