Four things you save by taking shorter showers- time, water, money, and energy. I've been trying to do a little research and from what I've read, older shower heads use 4.5 gallons of water per minute. I read something about new regulations coming out in 1992, reducing the amount of water used to 2.5 gallons per minute, but still. That's a lot! And sure, it may not seem like tap water is that expensive gallon to gallon, but let's say you have a brand new shower head and take a 10 minute shower once everyday. That's 9125 gallons of water used, just from showers! Not to mention the water we use to brush our teeth, do the laundry, watch the dishes, drink, and so on. Shortening your showers, even by just a few minutes, can really make a difference in the long run.
If you check out this site here, it lists some other ways you can conserve water. It also has a "water footprint" calculator. If you consider daily water use, and the water used to create all of the goods we eat, use, and buy every day, they estimate the average American uses 1,189.3 gallons of water per day (that's a lot!). Besides, shortening showers to save energy, water, money, and time is pretty easy considering!