The trial comprised 183 days of hearings held from 1963 to 1965. The 430 hours of the testimony of 319 witnesses, including 181 survivors of the Auschwitz concentration camp and 80 members of the camp staff, the SS, and the police were recorded on 103 tapes, and 454 volumes of files that were stored at the Hessian State Archives in Wiesbaden.
