Unless its changed, there was a
HeliTrainingcom in 2005:
Initial Single Engine Type Rating (Turbine<3175kg or Piston) is
5 hrs (all excluding test)
Any subsequent Single Engine Type Ratings falling into the above categories are
3 hrs
Initial Single Engine Turbine>3175kg OR Multi Engine Turbine is
8 hrs Subsequent Multi Engine Type Ratings are
5 hrs
Initial Multi Pilot ratings
10 hrs Subsequent Multi Pilot ratings
5 hrs
Additional requirements for differences training, and for adding instrument privileges.
I'm sure LASORS will show if it has changed again. Hope that helps