Students have the whole period to complete the Unit 4 Exam. They may use their cheat sheets, a calculator, and a ruler.
For the modeling section (Task 3), students need to know how many days there are in each month. If I see that this is a problem, I'll write this information on the board.
With 10 minutes left in class, I tell students to stop what they're working on and to complete the self-assessment with as much detail as possible. When I assess this exam, I am as interested in understanding how well students understand the learning targets, as I am in what work they were able to complete.