Explanation:

- Option 1: Within a month

- Implies a period of time lasting one month.

- Not related to the idiom "at a stretch," which deals with continuous action.

- Option 2: After some time

- Suggests a delay or break before an action resumes.

- Does not align with the idiom's meaning of uninterrupted activity.

- Option 3: Without a stop

- Indicates continuing without any breaks or pauses.

- This is the correct meaning of the idiom "at a stretch."

- Option 4: During a year

- Refers to events happening within a year.

- Not directly linked to the idea of doing something continuously.