So what amount of time makes one an astronaut?
An astronaut (from the Greek "astron" (ἄστρον), meaning "star", and "nautes" (ναύτης), meaning "sailor") is a person trained, equipped, and deployed by a human spaceflight program to serve as a commander or crew member aboard a spacecraft. Although generally reserved for professional space travelers, the terms are sometimes applied to anyone who travels into space, including scientists, politicians, journalists and tourists
So based on this definition he earned his wings.
If he does not meet the definition then the term is meaningless. Simply put, all "Astronauts" have done the same ten minute ride. They did it at the beginning and end of their missions. Does performing monkey do tasks make you an astronaut? We have electricians who do the same thing on earth as they do in space, except they know how to change things out and do not have the benefit of 20 people telling the monkeys how to do it. How about plumbers? In space the monkey turns the screw that 20 people tell him / her to do. How about monitoring space experiments? Monkey see monkey do..
The point is this... It does not matter the time or task spent or performed in space. It is the getting to space that makes you into an astronaut. Shatner went into space "Astro", sailed in the heavens for ten minutes "nautes".
You might want to put more into this and say he was along for the ride, so do we strip away all but the pilot and co-pilot from the title of astronaut? Because... You know the others were just along for the "Ride".
We could go on and on... or more likely I could but in the end I was looking for opinions and it seems at least here I am the only one that sees this honorarium as being deserved by Shatner. I am jealous that he could go on that "Ride"... because I would do it and go to mars in a heartbeat if I could and while I would care less if you would call me an astronaut or not... I still would be because I sailed among the stars...
Better to be an inspiration to millions than a name no one even knows with the title ... Astronaut... Because if you asked people who Captain Kirk is most would say Shatner if you asked who Sally Ride is most would not even know... But you know she is an Astronaut because she went into space.... like Shatner...