After analyzing the relationship between the feature 'duration' and the task of whether a person receives a credit or not, here is the dictionary with the specific details:

```json
{
    "yes": [6.0, 9.0, 12.0, 18.0, 24.0],
    "no": [6.0, 12.0, 36.0, 48.0, 60.0]
}
```

In the target class 'yes', typical values for the duration feature are 6, 9, 12, 18, and 24 months. Conversely, in the target class 'no', typical values for the duration feature are 6, 12, 36, 48, and 60 months.