classes:  lecturer. extend the duration of the lesson 30 - 45 minutes but do not make the lesson more effective.  curriculum. extend the duration of the lesson 30 - 45 minutes but do not make the lesson more effective.  facility. extend the duration of the lesson 30 - 45 minutes but do not make the lesson more effective.  general. extend the duration of the lesson 30 - 45 minutes but do not make the lesson more effective.