residential refrigerator, how long will it run on batteries?

I had unplugged my RV to moved it and forgot to plug it back in. Went 4 days no problem. Course it was just sitting I wasn't opening and closing the refrig doors. But batteries were hardly down much at all. When were traveling many times we don't run the generator and haven't had a problem. Yes I have the Samsung. Took out the Norcold and installed the Samsung. Best mod I ever did. Won't buy another rig without a residential style unless it's a REAL good $ and I can swap it to residential fairly easy.