Passage: On September 6, 1901, Leon Czolgosz, an unemployed factory worker and registered Republican with a history of mental illness, shot US President William McKinley twice during a public speaking event in Buffalo, New York. McKinley was hit in the breastbone and stomach, and died eight days later. Czolgosz was arrested, and interrogated around the clock. During interrogation he claimed to be an anarchist and said he had been inspired to act after attending a speech by Goldman. The authorities used this as a pretext to charge Goldman with planning McKinley's assassination. They tracked her to a residence in Chicago she shared with Hippolyte Havel, who had come to the US; as well as with Mary and Abe Isaak, an anarchist couple and their family. Goldman was arrested, along with Isaak, Havel, and ten other anarchists.

Question: How long did the questioning go on?
around the clock