This is a great lesson to begin a unit on time. This activity can be completed as a class or in a small group. Students will need a set of time length cards (second, minute, hour, day). Hold up the picture cards and have the students select the correct length of time card. Continue with as many examples as needed. If students are struggling with this concept call on a student to act out an example. When students have mastered this concept they can complete the Length of Time partner activity.