The commercial/private PTS says you can do it at 65% power or even less for high performance airplanes. Check out page 2-27 of the PTS. "Establishes the takeoff or departure configuration. Sets power to
no less than 65 percent available power." For private training it must be done to the full stall, commercial only needs first indication.
http://www.faa.gov/education_researc...S-8081-12B.pdf