How big is a photon?

When information is readily available, as it is with an Internet connection, finding it through means such as a search engine can often be about asking the right question.

How big is a photon, ends up being one of those rabbit hole questions that causes a computer screen to fill up with scads of information and no real answer.

Its a nice little info bomb to prove how inadequate the standard interpretations of physics' amazingly accurate Standard Model are. Have a read of some of the answers below:

How big is a photon and what does it look and behave like?