You want the audience to love you and appreciate you and bring you back again and again? Finish your presentation sooner than was planned.
You don’t need to finish a lot sooner. But sooner. Even ending 5 minute early will be seen as a positive. Conversely, going over time is very bad form. I attended a seminar put on by a presentation training company and one of the main themes of the talk was how important it was to end your presentation within the time allotted. The speaker ran over by 10 minutes! We thought that was a) pretty funny, and, b) we’l;l never hire them.