Why? Because every presentation should be judged from the audience’s point of view, and 15 seconds is about as long as you can reasonably assume someone will give their attention for free.

If your presentation doesn’t give them a reason to listen beyond the first 15 seconds, why would they?

At that point, for them, it’s already over.

Great presenters are ruthless about how they use those opening moments. In the first 15 seconds, the job is simple: establish value.

Some do this by stating the value exchange directly – their knowledge for your time. Others open with a question or a challenge that pulls the audience in. One of my favourite techniques is to make a promise – something specific the audience can hold you to.

Whatever the approach, it must earn the next 15 seconds. And then the next. And the next – until the presentation is done.

A lucky few can afford to burn precious seconds before delivering value, because their reputation has already done the work for them. This is most often the case for big name speakers, where the value lies as much in entertainment as it is in knowledge exchange.

In their case, the value is established long before they stepped on stage. But that still doesn’t mean they will have everyone’s attention at the 16 second mark.

For everyone else, there is no shortcut. It’s the hard grind of testing ideas, refining openings, and practising delivery until something consistently works, and then evolving it again.

This also means that if you have something important to say, you’d better say it early. The first 15 seconds are the only time you can be confident everyone is still listening.

Good presentations are exercises in holding attention. If you want the audience with you at the end, it’s far easier to keep them with you along the way than to win them back after you’ve lost them.

Yes, every presentation has highs and lows, and contrast matters. Even Mad Max movies need quiet moments so the audience can breathe.

But if that quiet moment comes at the beginning, you may never gain the momentum you need to carry your audience through to the end. Miss the first 15 seconds, and your presentation is effectively over before it’s begun.

Every presentation lasts 15 seconds.

Why? Because every presentation should be judged from the audience’s point of view, and 15 seconds is about as long as you can reasonably assume someone will give their attention for free.

If your presentation doesn’t give them a reason to listen beyond the first 15 seconds, why would they?

At that point, for them, it’s already over.

Great presenters are ruthless about how they use those opening moments. In the first 15 seconds, the job is simple: establish value.

Some do this by stating the value exchange directly – their knowledge for your time. Others open with a question or a challenge that pulls the audience in. One of my favourite techniques is to make a promise – something specific the audience can hold you to.

Whatever the approach, it must earn the next 15 seconds. And then the next. And the next – until the presentation is done.

A lucky few can afford to burn precious seconds before delivering value, because their reputation has already done the work for them. This is most often the case for big name speakers, where the value lies as much in entertainment as it is in knowledge exchange.

In their case, the value is established long before they stepped on stage. But that still doesn’t mean they will have everyone’s attention at the 16 second mark.

For everyone else, there is no shortcut. It’s the hard grind of testing ideas, refining openings, and practising delivery until something consistently works, and then evolving it again.

This also means that if you have something important to say, you’d better say it early. The first 15 seconds are the only time you can be confident everyone is still listening.

Good presentations are exercises in holding attention. If you want the audience with you at the end, it’s far easier to keep them with you along the way than to win them back after you’ve lost them.

Yes, every presentation has highs and lows, and contrast matters. Even Mad Max movies need quiet moments so the audience can breathe.

But if that quiet moment comes at the beginning, you may never gain the momentum you need to carry your audience through to the end. Miss the first 15 seconds, and your presentation is effectively over before it’s begun.