For me, anything over a few days of not being plugged in. There are parasitic loads drawing on the battery all the time. Those include your refrigerator electronics, clock radio, and propane detector. These slowly drain your battery until, it is dead. That is a good way to shorten the life of your battery. And, it sucks when you go out to the camper, everything is dead.
TV - 2015 Ram Truck EcoDiesel
TV - 2006 Jeep Liberty Turbo Diesel (Retired to Daily Driver)
TT - 2015 Rockwood Roo 183 (SOLD due to 2 years off work)
Nights Camping --- 2015 - 19 Camped | Winterized -- 2014 -18
Come read my Camping Blogs