Most major airlines over here are 8 hours, either fixed days off or rotating days off, and fixed shifts. Some are more progressive with ten hour shifts, but few ever rotate shifts.
First 8 (or ten hours, depending on shift) is straight time, next four hours at 1.5T overtime, then 2T after that.
Myself, I'm envious of United's ten hour/rotating days off schedule. five tens/three days off, the some four tens/four days off. More time away from the mismanagement.
Have y'all ever considered unionizing?