If an hunting knife is made out 440C stainless steel (RC 58)
And considering the strength of this steel for the knife edge, what is
the thinnest blade edge retaining its RC 58 sharpness and integrity 
inch  and MM
Would the 440c knife edge ever need to be re-sharpened?

I don't really understand your question:  
"what is the thinnest blade edge retaining its RC 58 sharpness and
integrity inch  and MM?"

The edge of the blade is obviously going to be extremely thin.  Are
you asking about the thinness of the rest of the blade?

Perhaps this site will give you some information about 440C steel. 
"Knife Steel" starts immediately when you scroll down.  The relevant
information is quite far down the page.