It's completely dependent on how you camp. If you don't use your wastewater tanks, have a
generator or
solar and don't mind taking the truck into town to resupply, you can last years.
So, how do you plan to use it? I have a
Bigfoot, not
Oliver, but for reference, if I'm using my trailer like a house: taking a shower every other day, doing dishes, cooking, occasionally using the toilet, I can make it 7-8 days before my grey water tank is full, and black water is getting close.
Propane easily lasts me a month, using the water heater, stove and sometimes oven.
I have
solar, but I easily went 7 days once with no
solar, and my
battery did fine. But I didn't run fans and didn't need the
furnace.
Anyway, if you don't have a way to charge the
battery, then you're limited by
battery capacity and waste tank capacity. You can replenish fresh water without bringing the trailer into town. Same with
propane and food. But when your waste tanks are full, it's time to pull the trailer into town.
But it varies. You could fill your tanks then just stop using them. Go to the bathroom and do dishes outside. You can go indefinitely. So it really depends on how you plan to camp.