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.