Our D2 went from long, self-indulgent showers at home as a HS student to remarkably quick and efficient showers as a college student at an East Coast LAC that places no restrictions on water use. Some of that may be a conservation ethos, but I suspect mostly it’s just a common courtesy thing when showers are shared. No one wants to be known as a shower hog. There’s also a different set of time demands and opportunity costs as a college student. D2 has always preferred to shower at night, after studying is done and before bed. At home, dragging out the shower just meant more time for herself. At college, dragging out the shower would mean less time socializing with friends after the day’s work is done. Because she values socializing with friends more than alone time, long showers carry a higher cost at college. But the habit carries over when she’s home over breaks.