Forus0322 opened a new issue, #4140:
URL: https://github.com/apache/incubator-streampark/issues/4140

   ### Search before asking
   
   - [X] I had searched in the 
[issues](https://github.com/apache/incubator-streampark/issues?q=is%3Aissue+label%3A%22improvement%22)
 and found no similar issues.
   
   
   ### Java Version
   
   1.8
   
   ### Scala Version
   
   2.12.x
   
   ### StreamPark Version
   
   dev
   
   ### Flink Version
   
   1.17
   
   ### deploy mode
   
   None
   
   ### What happened
   
   The calculation duration ignores the condition that only start is null.
   
   ### Error Exception
   
   _No response_
   
   ### Screenshots
   
   _No response_
   
   ### Are you willing to submit PR?
   
   - [X] Yes I am willing to submit a PR!(您是否要贡献这个PR?)
   
   ### Code of Conduct
   
   - [X] I agree to follow this project's [Code of 
Conduct](https://www.apache.org/foundation/policies/conduct)
   


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