When using the web-based recorder the max limit a video can be is 10 minutes. Best practice suggests no longer than 30-60 seconds. Your goal is to catch their attention, provide the information and wrap up the pitch.
The Covideo app with iPhone or Android devices; the max limit a video can be is 10 minutes.
If a video longer than 10 minutes is needed, you may record from any other video recording device and upload that video file to your account. Any length video can be uploaded as long as the file size is under 2GB.