Conversation so far:
What was the investigation into Eden Natan-Zada about?
The Israel Police opened a criminal investigation into Eden Natan-Zada's lynching.
Why was Eden Natan-Zada lynched?
Eden Natan-Zada shot the bus driver, shot a man behind the driver, and fired into the rest of the bus, killing two young women and wounding twenty-one passengers.
Where was Eden Natan-Zada lynched at?
Eden Natan-Zada was lynched at Shefa-'Amr's primary Druze neighborhood.
What kind of movement did Eden Natan-Zada believe in?
Eden Natan-Zada expressed 'Just as I couldn't carry out an order that desecrates the Sabbath, I cannot be part of an organization that expels Jews.‘

Question: How long did the investigation last?
Self-contained rewrite: How long did the investigation of Eden Natan-Zada's lynching last?