Hello PR,
To display a countdown timer on the product page, please edit the product settings to include the sale price, sale price dates, sale price start time, and sale price end time. Then, navigate to 8Theme Product Options > General > Sale Countdown and select either Single/List/Grid. For a better reference, please see the images provided at the following links: https://postimg.cc/fkhqHDBt and https://postimg.cc/xkDL0TkL.
Best regards,
8Theme’s Team