The book of Job is just about the only Old Testament book with absolutely no time context. There's no time spent explaining exactly where Job lived (besides "the land of Uz"), when he lived, who his ancestors or descendants were, or how he's connected to the rest of the OT characters at all.
On the other hand, there's a great deal of time spent at the beginning of the book retelling the conversation between the LORD and Satan/the Accuser which occurred (implicitly from Job 1:7) beyond the Earthly plane. God never retells this dialogue to Job elsewhere in the book, so it's a mystery how the author could have learned of it.
My own conclusion from this is that of all the books of the Bible, this one is most likely to be fictionalized. Unlike the books of the Torah or the prophets of the Gospels, this one makes no effort to relate a historical tale. Job reads like a story intended to teach a moral lesson rather than to instruct about a major player in the history of Israel.