Request forms not allowing the data duration

Hello! I'd like to know if it is possible to, through Request Form, set the duration of a task. I tried to do it but I failed.
Exemple: When I fill the request we have, a new task is created. This task is coming with the duration of one day. And what I need is that this task gets created with, for exemple, the duration of 5 days.

What have I tried:
- Set the blueprint task with the duration alone. (Didn't work)

- Set the blueprint with the duration choosing the days. (Didn't work too)

I hope my explanation was a decent one, thanks in advance!  🙂