Which of this 2 conccenps really mean HR?

Hi,

I've seen many people talking about HR as "How long someone watches your videos" meaning that if someone watches the 70% of your video that person would be a HR view,
but I've also seen people saying that HR has got nothing to do with that but keeping a high number of views daily not matter the lenght of the view, so which one is correct? as far as one denies the other is not possible that both are true right?

On the other hand, If I've got a 50 sec video and the averege lenght of the views is 35 would that mean the video's got HR views because they've watched the 70% of the video?

(I don't know if I can edit the title, sorry for bad spelling words)

hr views may be required if your competitors have good retention views , if not then simple views will work good.

like backlinks are not only thing google considers in serps , yt also not ranks vides only depending upon HR views.
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I think it is about the watch time total not the amount of veiws or length, so if you have a 30 second video viewed 2 times all the way through it will rant better than a video 60 seconds watched once for a length of 59 seconds.