Stallone. A rather subjective answer to your question.
Looking ONLY at hours flown may not reflect the true wear and tear experienced. There was a time when the pax and freighter ops were split, AJX and AJV. I opted to stay on the pax operation. During this time we flew more hours than the AJV pilots, yet, it appeared we were less fatigued than the freighter plots. After the merger, I found my fatigue levels went up a lot, despite my monthly hours dropping by about 20%. The multi sector night flights and constant changing from day to night ops wore me out, despite the fact I was logging around 45hrs per month.
Overtime is paid out when one exceeds 70hrs per month, there appears to be a very active plan by scheduling to adjust rosters to keep people below that level.
To answer your question, simply, in the 17 years I have been here, I have averaged about 600 to 650 hours per year.