>>81795422
Well, anon, assuming we're dealing with one of those ubiquitous 20" Lasko box fans, we would have to find the RPM of its motor. As the RPM is not listed on any part of the Lasko website, nor anywhere else on the internet, given that most fans are measured in CFM (cubic feet/min), this will be are largest hurdle. Fortunately, we know that Lasko box fans use the fairly common "shaded-pole AC motors", which rest at about 1200-1600 RPM. (This part is sketchy, as I admittedly had to ask chatGPT what motor Lasko fans use).

Now, with the hard part over, the rest is simple multiplication. Since you're running this fan 24/7, that puts the rotations at 72,000-96,000 revolutions per hour, 1,728,000-2,304,000 revolutions per day, and 630,720,000-840,960,000 revolutions per year. You can probably get an exact estimate if you have access to an online receipt for the thing, or if you remember when you bought it, but chances are, if it was more than a year ago, your fan has made over one billion full rotations! :D