When I worked inthe USA, although it wasn't required for the FAA PPL, I always insisted that all students did some spin training. I must have done a zillion spins and I found that, in a C-150/152, you will lose 700' every time in a 360 degree one-turn spin, 900-1,000 feet in a 720 degree two turn spin and watch it wind up from there. This works EVERY time. Try it and tell me if I'm wrong!!!!!!!!!!!!!!