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Please understand what you are asking has many different answers.
First understand that people will say this and that are 12V so doesn't use the inverter. This is correct, however, it still is depleting the battery. If you are not using the generator or shore power then all power comes from the batteries. The inverter takes the 12VDC and converts to 120AC. There is some residual loss in the inverter depending upon the model.
The batteries are rated in amp hours of usage. Depending on how many you have, what you run, quality of battery, care of batteries, etc. will dictate how long they will last.
Generally speaking, manufacturers intend the batteries to carry minimal base night time loads for the coach for about 8 hours (heat, fridge, night lights, etc, - Not Air Conditioning)
Do not run batteries below ~60% charge or you will ruin the plates and reduce the future capacity of the batteries. Generally speaking do no allow loaded voltage to drop less than 11.8 VDC before charging.
There are many resources on the web and forums discussing proper battery maintenance and usage. I would suggest for you to do your own research.
Hope this helps.
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