Hello @clement_dd_64
Welcome to eazyBI community!
Original estimated hours measure is related with issue creation date.
If you want to sum the hours based on a custom date, I recommend you reading this community post - Date in original estimated time by other date measure
This post will guide you through the steps to take to create a custom field using JavaScript code. After you import the field, it will create a measure “Original estimated hours with Released date”, and that measure will sum up all the hours based on your Released date.
Please don’t hesitate to contact me if you need any additional information.
Elita from support@eazybi.com