The average amount of time we spend in the shower is about 10 minutes, which is about five minutes too long. But it's understandable: It's hard to tell how long you've been in the shower ... unless you time it. Bring the kitchen timer into the bathroom and set it to five minutes. When your time is up, so is your shower. You can also sync your smartphone to a speaker and suds up to your favorite song. The average showerhead uses about 5 gallons of water per minute, so reducing your shower time saves 25 gallons per shower, per person.