Just for the record, PTC do not pay for the pre flight brief, nor the debrief, only the flight time, sim time or ground school time and the flying programme starts at 0830 and finishes at 2030 and each instructor is required to complete 8 hours of chargeable tution during that 12 hour duty period. That's 4 days on and then 2 days off.
And VFE, I totally agree with your statement, after 4 days of that you definately need the 2 days to recover.
The instructional time is not all flight time so the average of 120 - 140 a month is a combination of all three disciplines.