Moonraker:
If i work in an office the working time directive protects me such that i do not have to work more than 40 hours per week
I think you will find that it is an
average of 40 hours over a 17 week period.
Is the 900 hours limit total duty time or just the flying element?
If it is total duty time you could do all 900 hours in 17 weeks by doing 52 hours each week.
If it is just the flying element, on average, how many additional hours do you do each year (excluding travel to and from duty)?