Thank you ladies & gents to all those who cared to reply.
I've just worked out the averages (from 744 to ATR) in case you wish to see what side of the line you stand on.
Here it is for 1 (Northern) summer month:
Average Block Hours: 82.0
Average Duty Hours: 136.4
Stand Bys: 2.3
Days Away From Base: 7.5
Days Off: 11.6
Of course there's far more to it than the simple math to determine
how hard you work. Not all hours are the same, as no all days off are equal. But that would be another debate.