Is there any symbol [expression, figure of speech, metaphor] for something long in length in English?
for example, in Persian we say for a long word:
"the letters are set like train"
train mostly plays the role in Persian.
You could describe a word as "sesquipedalian". The property of length is "sesquipedality".
Also "sesquipedalianism" is the habit of using long words. So:
"Charles was a past master of obfuscatory sesquipedalianism. He was so keen at confusing by the use of long words, he would never pick a less sesquipedalian synonym or pass up an opportunity to increase a sentence's sesquipedality".
I'm sorry, I may have got carried away there. Sesquipedalian is, I believe, the word which you are looking for. Its Latin root means literally "a foot and a half".
It goes to the moon and back -- as a number of very long lengths/distances are compared against the distance of the earth to the moon (one time I saw Hansaplast advertised the number of plasters they've made so far as x times the distance to the moon and back).
This was probably popularized by Savage Garden who wrote a song with that title.
I'm not sure if Persian/Farsi is a polysynthetic language or not (like German, where words are often generated by mashing up already available words), but I think there is less emphasis in English to character count and more attention to "word quality" by which I mean aspects such as language of origin, class association, educational indication, etc.
When (American) English speakers use the term "Big Words" they don't mean character count, they mean words not in the common lexicon (like saying sophomoric instead of immature, only a couple letters off, but one is way bigger to some folks).
But if a language is more poly-synthetic, I imagine word length (character count) has more significance, as it carries lots of smaller words inside it to keep track of.