Creating a timed test

Is there a way to set up a timer so that when the students start their test they have 45 minutes. If they leave, when they come back its still remembering how much time is left? I want to lock all the answers once the time runs out.

I don’t believe there is currently a way to do this. Here is a post about a little something I played around with that can sort of mimic a timed activity (but it would NOT stop the timer if they navigate away from the activity).