Watch hours dropping after changing from private to public

Hi there guys I had a video with over 4k watch hours. I put it as PRIVATE and still showing as part of my all time watch hours in analytics.

However under my monetisation review it was only showing as 100 hours watch time.

I therefore changed the video back to PUBLIC. Unfortunately it still shows as only 100 hours under the monetisation page.

Does it take a certain amount of time for it to update??

yes you need to wait like 24 - 48 hours

Yes, sometimes it will take 2 or 3 days