10 km program with coach Jeff

hello, 
For the sprint race the program keeps adding repetitions. I arrived at 20 x 800m at an average of 4:05 per kilometer, which means that 
I run more than 2 hours and 23 km with the recoveries, and for the leisurely race the program suggests that I run 26 km with the warm up/down.
In comparison, the hill repeats are just ridiculous (8x 15sec of hill).
Overall, I'm getting exhausted and my chances of achieving my goal are decreasing: my VO2mx has been decreasing for several weeks and my estimated 10km times as well. Are we in the outline of the program? or the training offered must be recalibrated?