I believe that you need to set a firm schedule and make sure that you have enough time to completely debrief the objectives of your day. Write down the objective or competencies that you want to verify the learners have understood. I personally think it is better to have set aside too much time than not enough. For me, I can always discuss objectives longer or in greater detail if I have extra time. However if I have not set enough time than I may have to leave something out that I had intended on covering. Many consider the debriefing part of class to be the most important part leading to learner understanding so you may want to consider that when budgeting the time allotted.