Some students with difficulties or impairments will need more time to complete some tasks than the others: they may take longer to respond, they may have low vision and take longer to find things or to read them, or they may be accessing content through an assistive technology that requires more time.
Taking into consideration the possible disorder it is advisable to provide those students with more time.
There are a lot of settings that can be offered for the special uses, here just to mention few: to turn off or adjust the time limit, pause, stop the time, enable interruptions, information about the timeouts that could cause the loss of the data, etc. (WCAG 2.1)
One example for quizzes: it is possible to provide more time in automatically set activities
Source: WCAG 2.1, 2.2 – Enough time, How to Meet WCAG (Quickref Reference) (w3.org)
Settings in Moodle
The setting option User override enables to edit a password, change the quiz begin or end, to adapt the time limit and to edit the number of attempts for one or more students.
Find more about this setting: Quiz settings – MoodleDocs