Based on prior knowledge, the duration feature is likely to have some relationship with the target variable of whether a person receives a credit. In general, it is possible that individuals with longer durations may have a higher likelihood of receiving credit compared to those with shorter durations. 

To analyze this relationship, we can start by looking at typical duration values for individuals who receive credit ('yes') and those who do not receive credit ('no'). These values can provide insights into any potential patterns or differences between the two target classes.

Here is the dictionary with the specific details:

```json
{
	"yes": [12.0, 24.0, 36.0, 48.0, 60.0],
	"no": [6.0, 18.0, 30.0, 42.0, 54.0]
}
```
The "yes" list contains typical duration values for individuals who receive credit, including 12 months, 24 months, 36 months, 48 months, and 60 months. The "no" list contains typical duration values for individuals who do not receive credit, including 6 months, 18 months, 30 months, 42 months, and 54 months. 

These values are provided as floats in order to represent the length of time accurately.