This is of great significance. Bible students are aware that prophecy commonly uses words in symbolic and non-literal ways. This is even done with words that are generally understood elsewhere to be highly literal. But it proves absolutely nothing about how the word is used in historical or doctrinal contexts. Every one of them is literal.
None refer to vague or undefined longer ages.
Again, they are all literal, without exception. Never does Moses use the word to refer to vague or undefined longer ages. Furthermore, Genesis 1 and 2 are clearly intended to be history and doctrinal instruction. The rest of the book of Genesis is clearly intended to be history and doctrine. Only liberals and modernists who disrespect Scripture would attempt to say these accounts are symbolic or mythical accounts.