Car battery

It shouldn't be a problem. However what do you consider a long time? A week or two or six months to a year? The biggest issue with parking a car for a long period is rodent damage from it setting and the gas sold these days going bad.
If it is going to be parked for a very long time it would be a good idea to run it until the tank is almost empty, then disconnect the battery and put a battery maintainer on to keep it fully charged. If it will be stored outside I would consider jacking it up and putting stands or blocks under it to take the load off the tires and suspension as well. If you can have someone check on it once a week or two you could put some cotton swabs in it with peppermint oil on them that is supposed to help keep critters out but it has to be kept fresh to work. Put a note on it about the gas and battery. Then when you go to run it again you can dump a 5 gallon container of fresh gas in it and reconnect the battery.