https://wccftech.com/horizon-zero-dawn-sales-reached-20-million-new-forbidden-west-trailer/

Horizon Zero Dawn's success is a remarkable feat in the gaming space. The transition to PC has become a great endeavor from what the latest post in the PlayStation Blog has stated as it's been reported that as of November 28, 2021, the game has sold over 20 million copies with a total of 1 billion hours played.

The post on the PlayStation Blog describes this milestone: