Can you time yourself and see what you currently can run? A week out I wouldn't risk injury by running sprint repeats. If you could get to a stationary bike do intervals on that 3 or 4 times. Try 30 seconds hard, 10 seconds recovery for 10 sets. The 440 yd minimum time is a 10-minute mile. If you really aren't in horrible shape you should be able to run that without training to do it.