Final answer:
The exact duration of Miss Adela's family's residence in the town cannot be determined from the provided excerpts, as there is no explicit information on this matter.
Step-by-step explanation:
The question regarding how long Miss Adela's family has been in the town cannot be answered accurately without additional context from the source materials. Based on the provided excerpts, the duration of Miss Adela's family's residence in the town is not explicitly stated. These excerpts seem to come from various literary works or anecdotes that do not offer specific details about Miss Adela or her family's history in the town. As such, there is no definitive way to determine how much time Miss Adela's family has been in the town from the information given.