Timers in Forms

I use Microsoft Forms and use it for the creation of quizzes in the work place. What would be very useful in this program, is a functionality for adding a timer. 

For example, 

I'd like to create a quiz with say 20 questions and would like them to complete it in a set time or the form ends at the point they reached and them submits the form. 

Is this something that can be added to the program in future updates or as an add on?