The chronicler(s)

1 Chronicles 9:1-2 - All Israel was listed in the genealogies recorded in the book of the kings of Israel.

The people of Judah were taken captive to Babylon because of their unfaithfulness. Now the first to resettle on their own property in their own towns were some Israelites, priests, Levites and temple servants.

I wonder who wrote 1 Chronicles. Was it more than one person?

I wonder how long it took to write the book...er, chronicle. Was it done over a period of days? weeks? months? years? Were the first 8 chapters written before the captivity in babylon? Long before? Assuming what we have in 1 Chronicles is laid out in the order it was written, then everything from chapter 9 onward was written after the people were allowed to resettle in Israel.