Hello! How I can setup the final date of the Task trough a duration setup? Example: start date is today my estimasse duration is 15 days, so, the final date is today + 15 days, only bussines days. And if I setup the final date the duration is updated with the final date - Initial date = duration. 
I can to do this? if yes, where is the setup?

Hello Ederson, 

Thank you very much for your question. 
We have a feature request regarding the calculation of start / end dates based on duration which is scheduled to be released in version 12.1.0. I have left a vote for you. 

Here is our release plan. 

Kind regards
Samantha