I got a little chuckle out of your 2 Day comment. It is going to take a little longer than that to learn all of the cast.
If you are only getting 20 feet you are probably throwing the cast downward at the end. You can aim your roll cast upward to gain more distance. It is the same principal as when you make a regular cast. You can tilt the forward delivery higher to gain more distance. If you end any cast with the rod tip going down toward the water you will limit your distance.