You will be expected to do your full 90hrs duty
This really get's up my goat.
Full time employees work 38 hours per week, not 45, although as a Pilot you can extend to get the job done (which is why the 90 hour duty limit is there).
If you work over 38 hours in the week, or 76 in the fortnight, you are on overtime - plain and simple.
Put that in ya pipe and smoke it!