Muhammad Ali Asghar is an exceptional case. He might have been asked some more question which he might forgot while posting his interview experience. He must have handled opinion based questions very well. He also dropped some questions which cleary shows that dropping neelam ghar type question is not a major issue to be worried about.

His academic career is also superb which must have been considered by the panel. Educational experience at reputed local/foreign institutions must have contributed to his personality development, cofidence and pressure handling skills which came in handy in his interview.

Have a look at his educational profile:
MSc Public Management & Governance (London School of Economics & Political Science, U.K.)
Masters in Computer Engineering (University of Melbourne, Australia)
BS Computer Systems Engineering (Ghulam Ishaq Khan Institute, Swabi)

According to him, even he was a bit nervous after his interview thinking that he was not asked from his strength areas. So, you never know how are you going to be assessed by the panel. Time duration does not matter because Muhammad Ali Asghar got excellent score in a relatively short duration interview.

Don't think much about result. Keep yourselves busy in other activities. Because if one is over occupied with the thoughts about interview/result, it will rather increase anxiety and tension. Do what you can do now, that is 'Prayers'. May Almighty bless every one with splendid success!

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Best end of life is not knowledge but action.
Don't limit yourself to what you think people are expecting!