I turn on as needed, usually just in the evening to wash the day's dishes and to shower. Then it will remain off until the next evening.
There is the lengthy on/off debate... I lived in my trailer during weekdays for 26mo. My water heater is located under the master bed, so I didn't want it to wake me. I noticed it would cycle much more frequently during the colder months of left on, so it was more cost effective to turn on before use.
2005 2500 Cummins/48RE/3.73, QCLB, 4wd, BigHorn, Edge Juice w/ CTS + Turbo Timer,Transgo Shift Kit ISSPro Oil and LP pressure gauges, GDP 20/2 filters, Custom Diesel Steering Box Brace
'10 Forest River Shockwave Toy Hauler 21'
Honda EU3000I Genny