This would depended upon a) the quality of the course, and b) the experience of the candidate.
For example with good course material and a good instructor 4 + 2 for an ATR would be about right for say an experienced B1 or B2 already licenced on the Dash 8 series for example.
For a fresh B1 or B2 with no other ratings CASA would not just issue a licence without some solid experience.