Any longer than that and you are risking of losing the attention of your learners, so stay brief and to the point.The only exception to this rule is when you need to explain an idea in more detail, where the video can take up to 10 minutes. (learnworlds.com)
Experts in the European Commission also said the only exceptions to the net neutrality rules would be for content covered under national legislation, content that has to be filtered out to protect network security and integrity (such as malware), and cases where Internet traffic must be shaped to minimize temporary or exceptional network congestion. (fortune.com)
The only exception to this rule were guns: police officers did not make meaningful switches from guns to Tasers. (cnbc.com)