Remind your non pilot manager that 9 hours is a LIMIT not a target.
In The UK the 8 hours limit is prescribed in the Air Navigation Order and therefore becomes an offence if it is breached unless for reasons of safety or emergency.
Although there is a daily limit, there are also 3 day, 7 day and 28 day limits which effectively mean the average daily flying over a year cannot be more than about 3.5 hours per working day based on a 4/2 roster plus a couple of weeks holiday.