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Before we dive into the various hypothesis models, it it useful to list the points that all these models (and the wider academic historical circle) are in agreement on:
The disagreement over the models is solely focused on:
The main models with varying sources are usually illustrated by this combined diagram:
And for most of these components we have fairly accurate dates:
So if your question is "when was the most recent redaction/compilation done?" it could not have been earlier than the dates for the used components. So, for example, if you follow the D† argumentation, the last redaction could not have been before the 5th century BCE.
Modern scholars generally see the completed Torah as a product of the time of the Persian Achaemenid Empire (probably 450–350 BCE), although some would place its production in the Hellenistic period (333–164 BCE), after the conquests of Alexander the Great.
Poetics and Interpretation of Biblical Narrative By Adele Berlin