During one week, you must shower less than 30 minutes total.
Swimming or showering in a public pool does not count in this mission.
It's expensive to heat water. Therefore it's important to not shower long or too often. On top of that, almost all that energy is lost to the sewage system within a few seconds. About 10% of the typical household energy bill is for heating shower water. [http://sciencenordic.com/seven-tips-cut-your-co2-emissions]",