The maximum video length is 60 seconds per clip. When you upload a video, the picker defaults to the first 20 seconds. Drag the end of the picker to choose the start and end points for your clip.
Video resolution is 720p.
PhotoCircle Essentials
Higher resolution and longer videos (up to 4 minutes) are available through the PhotoCircle Essentials plan. Please note that upgrading your plan means that any new uploads will be a higher resolution, but resolution changes do not apply retroactively to previously uploaded videos.