Well, lets see, Ray.
I would normally complete 98-100 block hours/month, with an average sector of 4 hours.
However, during the first Gulf war, the carrier I was working for at the time operated 10-12 hour sectors Asia-Europe vv and, had an exemption from the local DGCA, to extend the maximum allowed monthly flying hours to 135, in agreement with ICAO, and this went on for three months.
A tad tiring, but on the other hand, the overtime sure bumped up the bank balance.
Lets face it folks.
Airlines today will get the absolute most out of flight crew, like it or not.
In reality, for the airlines, the only thing that counts is the bottom line.