Most definitely not. Comics come in all sorts of page lengths. It could be as short as a one-shot with just a dozen pages or a long-running series with dozens or even more. There's no fixed standard of 22 pages for all comics.
I'm not sure exactly. It can vary depending on the edition and printing. You might need to check with a specific publisher or collector for an accurate count.
Mini comics don't have a fixed page count. They can have anywhere from a few dozen to several dozen pages. It really depends on the content and the format the creator decides on.
The number of pages in The walking Dead comics can vary depending on the specific issue or volume. Some might have around 20 to 30 pages, but it's not a fixed number.
Try to limit the exposure of comics to air and moisture. Keeping them in a sealed container with desiccant packs can do the trick. Another thing is to avoid using harsh cleaning agents on the pages that might cause discoloration.