All in all, the 70-year-old future King of England performed 638 official royal engagements, with Camilla by his side, visiting a whopping 39 countries as part of the pairs many royal tours.
Whilst we all collectively picked our jaws back up off the floor at reading such a number, it turns out Charles' sons were equally as impressed with the royal couple's efforts, praising their father in a heartwarming video.
"There are so many things I admire about my father," Prince William begins, "His work ethic, his passions are absolutely crucial to how he's been such a successful Prince of Wales and a successful father."
SO SWEET.
Passion seems to be the theme, as youngest son Prince Harry also praised his dad's dedication.
"He's incredibly passionate. And he wants that responsibility.
The amount of knowledge that he has, there isn't anyone better."
The Duke of Sussex has recently moved into his home at Frogmore Cottage with Meghan Markle, as the couple embrace being first-time parents, raising their son Archie Harrison Mountbatten-Windsor.
Prince William and Kate Middleton were last spotted together mingling with other members of the royal family at the Royal Ascot in London.