Hello @Manmadha
Welcome to Atlassian Community.
Sorry, but I think I didn't understand what exactly you are trying to achieve. Please, allow me to bring up some concepts so we can better understand we are on the same page.
About the example you provided:
For example: ORIGINAL ESTIMATE is 2 days, Start time is 2019.11.27, so when time goes to 2019.11.28, Time spent should automatically change to 2 days. Even if assignee did not log the time, it should change automatically for next 2days.
Actually, if you don't log any time after two days, the Original Estimate will remain the original value you configured (2 days), just like you expected in your example. The original estimate of JIRA Time tracking is based in the time spent of your issues and not in real-time, just like described in the documentation below:
- Configuring time tracking
That being said, if you are looking for a tracking solution that is based on real-time instead of the time the assignee has logged to your issues, I believe you can use the due date field to configure date you want the assignee to finish the task, optionally updating it when the issue is transitioned or assigned by the responsible user. For example: If you want your assignee to complete the task in the next two days, set the due date to December 4th.
Please, let us know if you have any questions about the steps provided above.
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