You can leave your EV at a charging station until it is fully charged. Take caution, some providers have a price structure that charges you per minute. That means, even after your car is fully charged, you will have to pay the minute-price (often considered a "cost for parking"). Please consider this before parking your car for an extended period of time.
We would ask you to remove your vehicle once charging is done so that it can be made available for the next driver.