The back ground to the Interview technique is :

As you start your reply to the interview question, you interviews has full attention. As more time passes his attention is decreasing rapidly. After 60 seconds, you have basically lost him/her. So aim to deliver the answer in less than 60 seconds. Delivering your highlight after 60 seconds will not necessarily reach the interviewers head! If you are not convinced by the level of detail you have given. Ask: "Do you want me to expand more on this?"