For me showering means standing in a windowless room staring at a blank wall for 20 minutes (I get lost in my thoughts). Also there are several steps and I have to think about each of them.
This means that I only end up showering when my fear of coming across as dirty becomes bigger than the dread of being bored.
What do you do?
The ROI is long term, and not sure if it would actually happen, considering potential mechanical failure. My best plan for a high ROI is to put a hydraulic solar panel on the roof. Just need to get round to it, so many other jobs taking priority at the moment.