Conversation so far:
What was Erich Mielke's trial about?
The trial was about Erich Mielke's involvement in a murder.
Who was Erich Mielke accused of murdering?
Erich Mielke was accused of murdering Captain Franz Lenck.
What was the motive behind Erich Mielke killing Captain Franz Lenck?
Heinz Neumann and Hans Kippenberger, Erich Mielke's bosses, received a dressing down from Walter Ulbricht, the KPD's leader in the Berlin-Brandenburg region. Lench was a fellow officer of Ulbricht's
How long was Erich Mielke's trial for the murder of Captain Franz Lenck?
Erich Mielke's trial for the murder of Captain Franz Lenck took twenty months of one-and-a-half hour daily sessions.
What was the verdict for Erich Mielke in the trial for the murder of Captain Franz Lenck?
On 26 October 1993, a panel of three judges and two jurors sentenced Erich Mielke.

Question: how long was he sentenced to
Self-contained rewrite: how long was Erich Mielke sentenced to in the Bülowplatz trial?