Interesting to note that whilst in most serious airlines, logistics are in place to monitor and ensure that crew do not encroach on this limits, otherwise they are immediately stood down, and a standby called out, however in several other airlines where economic considerations and cutting corners over-shadow safety issues, you find crews being encouraged, coerced and sometimes roastered and compelled to bust this limits.
Unfortunately cos of unprofessionalism, fear or greed, some crews are quite happy to acquiesce.
