Nobody's job title is "answer reviews," so the work happens in the cracks, and the cracks are where the time goes.
First someone has to notice the review exists. Google buries the notification, Yelp sends it to an inbox nobody owns, and the industry site your customers actually use gets checked when someone remembers. Then comes the reconstruction: who was this customer, which visit or order are they describing, and did it happen the way they say.
The negative ones cost the most. A one-star review triggers a group chat, three competing drafts, and a debate about whether responding makes it worse. Days pass. Prospects read the review, then read the silence.