Hi, I think your method is in the correct direction, which assigns the quiz to two groups of students and set different until times.
But I think you need to manually add extra time to those DS students, in the "Moderate Quiz". For example, suppose the quiz time limit is 2 hours for other students, 3 hours for DS students. You can only set 2 hours time limit on the quiz page. It is a general setting for all students.
Then we can set the available time for all other students as 1:00 pm ~ 3:00 pm (or a litter late, say 3:05 pm, to ensure they can have a full 2-hour quiz time).
Next, we can set the available time for those DS students as 1:00 pm ~ 4:00 pm.
However, this is not the end.
We need to further go to the "Moderate Quiz" part and give 1 extra hour to those DS students.
This time, it works.
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