I meant 1000 feet for all the aerodynamics to line up - most helos stabilise a ROD in auto of about 1800 feet/min and this takes around 1000 feet for this stability to be achieved. Rest assured you are not in auto should an engine failure occur inside the HV envelope.
GAGS
E86
PS If I had a dollar for every practice auto/PFL I carried out up to the age of forty I could have retired long ago!