Meetings tend to always have the same length - an hour, usually. But is there a reason for this, other than tradition and the default setting in organiser software? Why not schedule a meeting to only take 22 minutes? It's the same with presentations. Why do they have to take an hour? Why not 15 minutes including Q&A?
When you are asked to give a presentation, have you considered a format other than the usual hour? How long do you really need to cover your topic? Don't feel obliged to fill an hour when it would only take you 20 minutes to discuss your main point. Adding content that's not strictly relevant - just so that you can fill a timeslot - won't make your presentation any better or more memorable; quite the contrary actually.

