You can set a time limit for an evaluation to restrict how long participants have to complete it.
Steps to Set a Time Limit
Access Evaluation Settings
Navigate to Tools & Teaching → Evaluations
Select the evaluation you wish to configure
Open the Settings tab, then access the Settings sub-tab
Set Time Limit
Enter the desired time limit (in minutes)
Click Next step (bottom right) to save and apply your changes
Once set, participants will only have the set amount of time to answer all the questions in the evaluation. The evaluation will automatically close when the time expires.