Current advice from the United States Centers for Disease Control (CDC) states the following for proper boiling of water for safety, speed and efficiency.
1. For personal use, create a supply of water for cooking, drinking, and tooth brushing by bringing water to a rolling boil for 1 minute. Timing starts when the water starts to bubble. Cool the water then place in clean containers for use or refrigerate.
2. Hot (not boiled) soapy water can be used for dishwashing and kitchen/bathroom surface cleaning. As a precaution, add one tablespoon of bleach per gallon. Laundry water does not need to be treated. Unless specifically listed, water for showering does not need to be treated.