How 'Due Date' is populated in RITM?

[Suggy]

How 'Due Date' is populated in RITM? In OOB instance, it is showing 1 day from the request submitted date.

Note - 

1 . I changed Delivery time on catalog item  - no use

2. In workflow, everything is defined as empty. So no use

[Saurav11]

Hello,

Using workflow it has been updated. on your workflow there is tab " schedule" and you will find column "Expected time" , if any duration mentioned there, it calculates from there, duration + creation time = due date

Please refer the below article for more information:-

https://www.servicenow.com/community/now-platform-blog/delivery-dates-estimated-delivery-dates-in-yo...

Please mark my answer as correct based on Impact.