Yes, the maximum limit is 5 minutes for video shot in-app. By default however it is set to 3 minutes. To change this, go into your iPads settings>ClassPack by Easyblog and change the maximum length.
You can upload video not shot in-app that is longer than 5 minutes, however there is a limit of 500MB on any one file (which is around 10 minutes video).
If posting through a browser, the limit is also 500MB. We highly recommend compressing video first using a service such as Quicktime or Miro Video Converter.