FWIW I'm a low time PPSEL now doing a heli add-on and training in the ubiquitous R22. I just attained the 20 hours of dual requirement and my instructor and I are right now just starting to literally "check the boxes" off the SFAR 73 list:
(A) Enhanced training in autorotation procedures;
(B) Engine rotor RPM control without the use of the governor;
(C) Low rotor RPM recognition and recovery; and
(D) Effects of low G maneuvers and proper recovery procedures.
So far I've done about 10 straight-in autos starting at 1000 AGL and now down to 800 AGL. I don't think we'll be going any lower but I'm sure we'll do a few more. We are supposed to start 180 autos next lesson. I do not believe they'll be getting any more "enhanced" than that. (It's always noteworthy to me that everything we "learn" in aviation is based on such very few repetitions.)