Too many variables have been quoted here!
Everything depends on
Is the aircraft being maintained (operated) as a class A or a Class B aircraft. There are 2 different methods of time measurement involved, the watch or the calender.
To further muddy the waters, which approved system of maintenance is being used, is it:
Manufacturers System,
CASR part 105 annex A
or
Another system approved by CASA.
All aircraft are either A or B and then one of the 3 maintenance systems are applied.
Simple
really!
ding