Watch time is only available in minutes in YouTube Studio. We know you can't do everything just yet and we’re working on bringing over the last couple of features! For now, you can temporarily go back to Creator Studio classic until the feature is available.
@TeamYouTube I've been at this for some time now, but till now with no luck. I know how to change the analytics for the watch time from minutes to hours in the OLD creator studio, but how can I do this in the NEW creator studio?? Thank you for any info on this. 

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Thank you for the update!
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