Setting Up Default Due Dates for Task Being Linked to a Specific Question in a Questionnaire
There are two ways to proceed: either set this value on each individual question as follows.
1) Open the settings of a question:
2) Scroll down to the Task Management section and expand it
3) Change the individual question value here:
And eventually save these changes.
Setting Up Default Due Dates for Tasks Being Linked to Any Questions in a Questionnaire
... or use a more global approach by looking at the questionnaire settings:
and scroll to the tasks section:
If you put something on an individual question, it overrides whatever the standard for that severity level is.