HCG: couldn't pay me to touch that stuff.
500-700 calories: starving yourself will only cause your body to burn muscle along with fat.
2-4 hour workout 5 times a week: Your calorie count won't support it, your body needs fuel to exercise.
I'd suggest you don't even bother weighing yourself, get a pair of skinfold calipers and use that to track your progress as it's more relevant to track body fat percentage (for your age you can aim for around 2-3%)
Bin the HCG, you don't need them.
Set your calories to 1800 to begin with, keep your food choices healthy (Lean meats, eggs, vegetables, nuts, fruit etc) learn about daily calorie requirements and adjust as needed.
Make sure you don't spend time in the gym just for the sake of being there.
For strength training work a muscle group over 3 sets with 3 minutes rest between sets. work your muscles to the point of failure on each set. (you can use the 3 minute rest time to work a different muscle group if you wish)
For cardio try to break it up, no more than 2 hours straight (preferably 1), incorporate HIIT principals if you want to push yourself.
take a consecutive week long break from exercise once a month.
As to how fast... after the first few weeks expect no more than 2-3Lb per week.
Tourny