Enumeration of date windows for TV campaigns.

| Enums ||
|---|---|
| `WEEKS_UNSPECIFIED` | Default value, should never be set. |
| `DAYS_ONE` | One Day. |
| `WEEKS_ONE` | One week. |
| `WEEKS_FOUR` | Four weeks. |
| `WEEKS_EIGHT` | Eight weeks. |
| `WEEKS_TWELVE` | Twelve weeks. |