You can add accommodations for a student in New Quizzes. Accommodation settings include adding or removing time for all assessment attempts, and multiplying time limits by a set multiplier.
Accommodations apply to all assessments in a course for a student and only one accommodation can be set per student. Set accommodations can be viewed in the Accommodations column and in the Moderate panel.
To manage timer settings for a single attempt, you can moderate a student's assessment attempt. Moderating an assessment attempt will apply any moderation settings on top of any set accommodations.
Open Accommodation Settings
Find the student you want to apply accommodations for . Then click the Edit icon .
Select Time Adjustment
In the Time adjustments menu, select the time adjustment option you want to give the student.
Give Additional Time
To add additional time, select the Give additional time option in the time adjustments menu . Then use the Hours and Minutes fields  to add additional time.
Remove Time Limit
To remove the time limit, select the Remove Time Limit (unlimited) option in the time adjustments menu.
View the student's accommodations in the Accommodations column. This column displays the cumulative effect of accommodations and moderation timer settings.