We don’t have the duration parameter on the video object itself, so what you can do is get it from the video status API https://docs.api.video/reference/get-video-status. We have the duration in the metadata object.
The duration will be provided in minutes or seconds.
Another option if you are using the playerSDK is to use the getDuration() method.
You can find it here: https://github.com/apivideo/api.video-player-sdk#getdurationcallback-duration-number--void-promisenumber.