Based on prior knowledge and understanding of the problem, the feature "duration" likely represents the duration of the last contact with the client. To analyze the relationship between the feature and the target variable "Does this client subscribe to a term deposit?", we can examine the mean or median duration values for both the "yes" and "no" target classes. Additionally, we can identify typical duration values for each class to get a better understanding.

Here is the dictionary with the requested information:

```json
{
	"no": [ 80.0, 120.0, 180.0, 240.0, 300.0 ],
	"yes": [ 300.0, 360.0, 420.0, 480.0, 540.0 ]
}
```

The list of typical durations for the "no" class appears to be [80.0, 120.0, 180.0, 240.0, 300.0], while for the "yes" class, the list is [300.0, 360.0, 420.0, 480.0, 540.0]. These duration values represent examples of possible durations for each target class.