53 Minutes, 4.7 Mile Treadmill Routine:

Time Speed
0:00-20:00 4.0 and 2% incline
20:00-23:00 6.0
23:00-25:00 6.5
25:00-26:00 7.0
26:00-50:00 repeat mins 20-26 4 more times
50:00-53:00 3.5
Total: 4.7 miles