Based on prior knowledge, we can analyze the relationship between the "duration" feature and the task of whether a person receives a credit or not.

Analysis:
It is likely that the duration of a loan may have a significant impact on whether a person receives a credit or not. Generally, longer durations may indicate higher risk as it takes longer to repay the loan, while shorter durations may indicate lower risk as the loan is paid off quickly.

Dictionary:

```json
{
	"yes": [12.0, 18.0, 24.0, 36.0, 48.0],
	"no": [6.0, 9.0, 15.0, 30.0, 60.0]
}
```

In the dictionary, I have included 5 typical duration values for each target class. For the "yes" class, the durations are 12.0, 18.0, 24.0, 36.0, and 48.0 months. For the "no" class, the durations are 6.0, 9.0, 15.0, 30.0, and 60.0 months. These values represent a range of durations that are common for each target class.