What’s the worst presentation sin?
Not respecting time.
Don’t make the mistake of thinking that your time is more valuable than the collective time of your audience.
Just because you were told that you would have a 60 minute time slot – don’t count on getting 60 minutes to speak.
Why? Because things change.
Be prepared and flexible to change your presentation. Be prepared to leave something out.
Your audience doesn’t need to hear everything that you wanted to say.
If you were told to prepare a 60 minute speech, be prepared to deliver it in 50, 45 or 34 minutes.
For that reason never leave your important point till the end. If you do you might not get to state it. So get it out early and use the rest of the presentation to reinforce the message.
If you are allotted 60 minutes for your presentation, be sure to finish in 58 minutes.