Based on prior knowledge, the duration feature can be analyzed in the following way to determine its relationship with the target variable (Does this person receive a credit? Yes or no?):

- Persons with longer durations may be more likely to receive credit as they have a longer period to fulfill their financial obligations.
- On the other hand, persons with shorter durations may be less likely to receive credit as they have a shorter period to fulfill their financial obligations.

Based on this analysis, let's create the dictionary with the duration values for each target class ['yes', 'no']:

```json
{
	"yes": [12.0, 24.0, 36.0, 48.0, 60.0],
	"no": [6.0, 9.0, 18.0, 30.0, 42.0]
}
```

Please note that the specific duration values provided above are examples and may not represent the actual data.