Schedule for today was 5 easy, 35 hard, 5 easy but I was worn out. I just opted for 4 laps (3.2 miles) as hard as I could which wasn't hard but high heart rate. That took about 33 minutes so I trucked on until my watch read 35 and slowed for cool down running gently for about 3 more minutes to get to the car then walking a bit. I just didn't have gas in the tank for 45 minutes.