How does YouTube measure watch time in case of accelerated playback?

Through YouTube Studio, a creator gets many audience statistics about the videos of the channel. Among those measurements, there is the watch time typically reported in hours. I am wondering how those measurements interact with the Playback speed feature of the YouTube viewer. More specifically, if a visitor watch a 10min video at 2x playback speed in 5min (wall clock), does this event count as a 5min or 10min view event for YouTube Studio?

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Author: Joannes Vermorel