Conversation so far:
When did the trial take place?
1992.
What was the verdict?
convicted on two counts of murder and one of attempted murder.
Who was the first person murdered?
Captains Anlauf and Lenck.
Who was the victim of the attempted murder?
Senior Sergeant Willig.
Did he know the murder victims?
CANNOTANSWER.

Question: How long did trial last?
Self-contained rewrite: How long did the 1992 Bulowplatz trial last?