Duty & standby times are *very* subject to the rules & regs of the particular country. Our FTL scheme in the UK wasn't too bad.
Could still be fatiguing though: The a/c had no radar, no GPS. Just the standard VOR (2), ADF (2) , DME (1) & autopilot. This for often low level night flight into no-radar/no navaid islands in the North Sea. At least they had de-icing & a HSI & 1 RMI.