The activity can be as involved as you want. This is usually one of the favorite parts of teaching math for my classes. Children get to create a spy name, complete several activities related to time, and solve a fictitious crime.
The lesson involves reading time, writing analog hands, solving elapsed time problems, 24-hour time, digital and analog time, time with words, and American time zones. Papers can be printed out into a packet for each child. The answer key is not included because it's more enjoyable to go through the activity with the class.