Car is no smoking, no pets and no eating. You are free to drive the car as much as you want, there are no millage limitations. The car will be provided with close to 90% charge, and needs to be returned with at least 50% charge only.
There may be circumstances where the car may have come back from a trip just prior to your trip, and has not had an opportunity to reach 90% charge. In those circumstances, you will only need to return the car at the rate you received the car.
My objective is to make your experience special and hassle free, you should not have to worry finding a charger before giving the car back.