A Lightning Talk is a short presentation given at a conference or similar forum. Unlike other presentations, lightning talks last only a few minutes and several will usually be delivered in a single period by different speakers. The length of talks are usually between 1 and 10 minutes with a 5 minute limit being common. In order to allow rapid changes between speakers, slides may either be discouraged or a single computer running a Presentation program is used by all speakers. Ignite is a style of presentation where participants are given five minutes to speak on a subject accompanied by 20 slides. Each slide is displayed for 15 seconds, and slides are automatically advanced. Pecha Kucha is a similar format that features 20 slides for 20 seconds each Speed geeking is a great way to quickly view a number of presentations and demos in a short while. For example, one hour is enough time to view 12 presenters if you spend 5 minutes at each presentation. The 5 minute limit also keeps presentations short and interesting. Each presenter has to give their presentation multiple times.