Final answer:
The time since Miss Hinch committed the crime is not specified in the provided excerpts, making it impossible to determine without further context from the story.
Step-by-step explanation:
From the excerpts provided, it is not explicitly stated how long ago Miss Hinch committed the crime. The texts revolve around different characters and situations, with crime and justice as underlying themes, but none of the segments specify a timeline concerning Miss Hinch's criminal actions. Therefore, without additional context or information from the rest of the story, it is not possible to determine the exact time frame since Miss Hinch committed the crime.