Your presentation should be exactly as long as the time allotted. Using substantially less time will make your presentation seem incomplete or superficial; using substantially more time may alienate your audience. Plan your presentation to allocate sufficient time for an introduction, concluding remarks, and follow-up questions (if a question-and-answer session is to be part of the presentation). If you are giving a scripted presentation, each double-spaced page of text will probably take two minutes to deliver. Time yourself to be sure.