I've found a 39-minute version of that video where Kurena Watanabe appears for about 5 minutes. Given that the full DVDPS-023 adult film runs for 120 minutes and features over a dozen actresses, it’s likely each one has roughly 5 minutes of screen time.
I’m based in China and not sure how to accept payment internationally, so I’d be happy to share it with you for free—consider it a gesture of friendship.