Edison Rex 11 is available now on Comixology:
This issue takes place in the Golden Age where we see Gladiator Gladstone in his prime and meet the first person to don the mantle of The Eclipse as well as his partner in justice: Mister Oni.
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So I've mainly seen Alan Moore throw around this method for figuring out how many words fit on a page or in a panel. He attributes it to Mort Weisenger, a former editor of DC Comics.
Basically it breaks down like this. He proposes that you can comfortably fit 210 words on a comics page without it looking too text heavy. So if you have a six panel grid you've got 35 words per panel.
I think this is a great tool for writing comics where it's important to say as much as possible with as few words as possible as space is limited and the word/picture ration is important as far as being pleasing to the eye. Another way to put it: If it's too long