Research proves that two 20-minute workouts will burn more fat and calories than one 40 minute workout. Doing a second workout during the day (even a short one) keeps growth hormone levels high throughout the day. This will give you even more body fat burning.
As a former college football player, I dreaded the repeated two-a-day practices for the first 2 weeks of training camp! Let me tell you, it was tough! But guess what? I was in the best physical shape of my life and I could sprint forever!
To this day, I still routinely break up my workouts into 2 sessions and sometimes 3 sessions. The sessions are usually about 20 minutes each and very intense---whether it be circuit weight training or interval cardio. It works every time to burn massive amounts of calories and to keep my metabolism"ramped up."
Why don't you try two-a-day workouts for a few days? You will see a significant reduction in your weight loss and fat loss provided that you follow your meal plan!