I only did 12 hours, I have signed off IBA level 1,2,3 after 8 hours, while also exploring all level 3 dynamic moves. Good with belly face in carving too:)
By 10 hour I could comfortably sitfly carve, comfortable with help of a coach to do back to belly layouts and a bit less so with belly to back layouts. I was okay with back in face carving but at slow speed, getting there with knee flying and outface carving. I also did about 20 mins Head down by then, but I struggled a lot... I still do and I only lifted once for a few seconds with help of a coach and a spotter.... so that will be a long road for me.
I found it hard to compare to other flyers, I was eager to learn quick, but other who had more physic did learn certain things quicker. I had to learn to fly (especially sitfly) without using my arms as they are weak... hehe