A brief presentation

Is it?*

Don’t say it unless you’re sure.**

*Brief depends on context, but in the absence of a clear norm a 5 minute presentation – 10 minutes including pre- and post-amble – is a good rule of thumb.

**Even if you are, it’s probably better to say how long – and always say it will be five minutes longer than you plan to be.

I'd love to hear your thoughts and recommended resources...