On saturday when I was in this long queue, there was an Alto, green color, LEB 12 6240 which was driven by a driver. Now in total I spent 1hr 45mins in line, and that driver saab kept the engine start with AC ON for about 1hr. and 15mins. while everyone turned off engine after moving bit forward, that guy was "enjoying" AC ki thandi hawa.... and for very less time he came out of the car, may be just to breath in fresh air.....
this is how drivers ruin the vehicles. To save money on CNG he burned petrol for more than one hour, and the wear n tear happened to engine is separate during this idle time.