From my own experience. I have nowhere near that amount of battery and even from 30% it takes nearly 48 hours to charge when at the RV park
Which voltage are you using at the RV park? What type of EV?
There are many other variables too, such as the type of AC input charger inside the vehicle. Old Teslas used 24KW, newer ones use half that, 12KW. This makes sense because many years ago, they didn't have the DCFC networks they have today, so faster AC input charging was needed, especially when on the road. Today, 12 KW or less is standard for home charging and at motels and such. The norm if to be able to fully charge a near dead battery to 100% overnight.
Such as at my homes. For an example, 12KW to an 80 KWH Tesla LR battery. 80KWH (my Tesla M3 LR battery) divided by 12KW=6.66 hours. In reality, more like 8 hours because of the slowdown above 80% SOC and the small losses in heat. But that is from very dead to completely full, which is very rare to be needed these days. So one night when sleeping should give all the charge anybody needs in most cases, by far.
The older Tesla destination charge stations as well as some J-1772 charge stations were often higher than 12KW. I have seen each at 70-amps at 240 VAC, (16.8 KW) but always older units and none of the newer EV cars (AFAIK) can do above 12KW AC input charging anyway.
But sometimes a little lower, as some places use the 208 volts from 3-phase AC industrial power instead of 240 VAC.
And some EVs can only charge at 32 amps @ 240 VAC (~7,680 watts) max.
But the charge times can be figured out with simple math by knowing all the numbers, such as the voltage and current capacity of the AC source as well as the KW of the EV charger located inside the EV.
The "pilot signal" of a J-1772 or Tesla Destination charge station (these are not chargers, but are usually incorrectly called such) will prevent overloads. IOW, you can put a 12KW charger (located inside the EV) on a 3KW charge station (just an AC source like any AC outlet) because the charge station sends a signal to the EV charger to tell the EV charger to reduce to 3KW (or whatever the charge station can handle). But then you charge at 3KW that will take four times longer than 12 KW.
-Don- Auburn, CA