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Letting your car idle isn't actively bad for the drive train, but it certainly does put strain on the engine, additionally engaging the AC will put the engine under load, and work the engine harder even though you're not driving anywhere.
Also, if you idle the engine excessively, you must visually inspect your oil, because you will need to change it more than every 3,000 miles. The answer depends on the fuel efficiency of your car, Whether the car is in Neutral, or drive, and the appliances (AC, radio, lights, etc) you have on. As an example, my car gets 27 MPG on the freeway going about 60 MPH. My gas tank is 18 gallons. This means that on the freeway, my car would run for about 8.1 hours.