How long does it take for newly published reviews to appear on the product page?

We’re testing Yotpo Reviews on a WooCommerce (Wordpress) website.

When we submit and approve reviews they usually do not appear on the actual product page until sometimes several hours later.  They do eventually appear on the product page ------ but hours later.

Is this normal?

Seems odd.   We don’t understand what the technical reason is for this.

New reviews appear just as slowly even if we change the setting in Yotpo.com > Reviews > Reviews Widget > General Settings > Select “Immediate Update (Temporary)”