How do we get the ability of a time limit on assignments the way it is with Quizzes?

I teach math asynchronously without a set meeting time, and I write quiz/test problems with answers that can fill up a page or two each.  I need to give them a time limit for the quiz/test.  What would work beautifully for me is to have a time limit for an assignment.

Using Quizzes will not work.  There is no way to annotate solutions effectively and efficiently using speedgrader within Quizzes, but there is in Assignments.

I have asked peers how they do it.  None have been able to work within the Canvas system without a compromise of the integrity of the test or without a very labor intensive solution.

Let me ask again, can a time limit be added to Assignments?