AI-generated Key Takeaways
- 
          The content describes an enum for the allowed maximum duration values for videos in non-skippable video responsive ads. 
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          The enum includes values for unspecified and unknown durations, as well as specific maximum durations of 15, 30, and 60 seconds. 
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          Each enum value corresponds to a different maximum allowed duration for non-skippable ads. 
Enum describing the allowed maximum duration values for videos used in non-skippable video responsive ads.
| Enums | |
|---|---|
| 
 | Not specified. | 
| 
 | Used for return value only. Represents value unknown in this version. | 
| 
 | Indicates that non-skippable ads must be at most 15 seconds long. | 
| 
 | Indicates that non-skippable ads must be at most 30 seconds long. | 
| 
 | Indicates that non-skippable ads must be at most 60 seconds long. |