what is learning initiative on going due date field meaning?

Summary

what is learning initiative on going due date field meaning?

Content

Hello,

In Learning when defining learning Initiatives for new employee enrollments -
On the first step 'Required Learning Initiative 'there is a field called -
'Ongoing Due Date' what is the exact meaning of it ? it understood that its the period of time the learning Initiatives definition is valid ,for  example if we choose 10 days - then only on the 10 days the learner population is active.
but in the guide its written : 'learners who take this course must complete the course within 20 days of taking the course after joining the organization.'