Your professor is telling the class that people need to develop social clocks. Thinking this is an odd phrase, you look it up in your textbook and discover that it refers to

Question

Quizplus · Accepted Answer

Developing a social clock refers to the ability of an individual to accurately evaluate their progress toward achieving age-related goals, such as getting a job, getting married, or starting a family, and the expectation of society regarding the timing of these events. It is important to develop a social clock in order to avoid feeling rushed or pressured to meet these goals too early or too late in life.

Your Professor Is Telling the Class That People Need to Develop