I have used 24-hours for forty years.
A big three way Norcold on the current rig.
Bag of ice in freezer, and then add only cold items.
Refer batt operated fan helps.
Unit will run "better" on propane than on AC or DC.
Airflow up the back of the unit is critical, and a sealed enclosure other than designed ventilation. Addition of external fans to that enclosure a common upgrade.
1990 35' Silver Streak
2004 555 Cummins
1990 35' Silver Streak Sterling
; 9k GVWR.
2004 DODGE Cummins 305/555; 6-manual; 9k GVWR.
Hensley Arrow. 10-cpm solo, 18-cpm towing
Sold: Silver Streak Model 3411