Student: "Dear professor - I am home sick. Can I take the exam on Monday?"
Me: "Yes. Let me know when you would like to take it. You can take it any time between 11 and 4."
On Saturday - NOTHING
On Sunday - NOTHING
On Monday during class -
Student: "Can I take the exam at 4:00?"
On Monday at 4:30 -
Me: "Dear Student, you are now past the time you said you would be here to take the exam. You MUST make it up on Wednesday between 11 and 4, or I will not allow you to make it up."
On Tuesday - NOTHING
Today, after failing to show up for class -
Student: "I'm sorry I wasn't in class. Can I take the test at 4?"
Me: "Yes, but I'm leaving at 5:00."
Today at 4:30 -
Student: "I'm here to take the test. I'll take it until you have to leave at 5:00."
Me: "No, I'll give you full time to take the exam, but we need to talk when you're finished."