It also depends on comfort level. Early in the thread I stated 2 weeks and that's without conserving anything. The water would go a lot farther with sponge baths instead of daily showers, propane can be stretched by cooking over the fire or via solar cooking although we could do a hot plate off of the batteries and solar.
That leaves food. The fridge is too small to hold more than a few weeks of fresh food and after that amount of time it isn't so fresh. Some can go in the freezer but not much. that leaves dry and canned goods for the long term.
As mentioned there is a two week limit on the federal land we use so if we stayed out longer we'd replenish while we moved. We have gotten away from the conserving thing.