The way I read it:
at least 20 hours of flight training from an authorized instructor and 10 hours of solo flight training in the areas of operation listed in Sec. 61.107(b)(3) of this part,
Section 107(b)(3) implies helicopter:
(3) For a rotorcraft category rating with a helicopter class rating: (i) Preflight preparation;
(ii) Preflight procedures;
(iii) Airport and heliport operations;
(iv) Hovering maneuvers;
(v) Takeoffs, landings, and go-arounds;
(vi) Performance maneuvers;
(vii) Navigation;
(viii) Emergency operations;
(ix) Night operations, except as provided in Sec. 61.110 of this part; and
(x) Postflight procedures.
If it were ME signing him off for the practical test, I would make sure he had 20 hours dual and 10 hours solo at a minimum. Others may read the regulations differently.....that is fine, he can go to them. Hopefully the FAA inspector or DPE agrees with them. In at least two FSDO's on the West coast that I deal with, he will need 30 hours. If he wants to only do 19 hours, I suggest he stick to the East coast.