The estimated length of time for the complete lesson is about 13-14 days. The estimated length of time for each activity within the lesson varies and is listed in parentheses after each Teacher Note. Most activities range from 45 minutes - 1 hour. There are a few activities that range from 15-30 minutes. Times may vary according to your implementation and student discussion time. These estimations include time for students to explore the information in the sidebars.