no .......and yes! haha, some people do and some people don't "many many years ago" "many, many years ago" Are both acceptable. HOWEVER, if I were writing a formal text, I would place a comma

Here's an example: "We've seen the Yankees play many, many times." The word "many", in both cases, is an adjective that describes "times", which is used here as a noun. When two or more adjectives get together in a sentence, a comma's supposed to show up and keep them apart. It makes for an orderly, smooth flow of words. The double appearance of "many" isn't a valid excuse for the comma's absence. BTW, no commatization needed between "many" and "times." Hope this helps!

i would not try to use "many many" or "many, many" i am sure you can replace the words or just leave it as 1 many for example, several years ago i saw the socceroos win. instead of... many many years ago i saw the socceroos win. eg. in the solar system it is unknown how many stars there are in the solar system there are many many stars

漢倫，還有一種"Many a"=Many, Many的用法對嗎？