Mary Ann Nichols, the first victim, was murdered on the 31 August 1888.
Mary Kelly, the last victim, was murdered on the 9 November 1888.
Mary Kelly, the last victim, was murdered on the 9 November 1888.
That's five victims (four if you exclude Stride) in a period of less than 2 and half months.
That's not long.
All the serial killers I've heard of murder over years before they are caught, not weeks.

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