5 cylinders, 5 individual smart coils. Max engine speed will be 8250rpm.

So with individual coils, each one needs to fire only once per cycle (2 cycles per revolution on a 4-stroke), so the time between firings is:

Rev/sec = RPM / 60 = 8250 / 60 = 137.5

Cycles/sec = Rev/sec / 2 = 137.5 / 2 = 68.75

Sec/Cycle = 1 / Cycles/Sec = 1 / 68.5 = 0.0146 or 14.6 milliseconds.

Coil charge time = 3 ms (correct this as necessary)

Duty Cycle @ 8250 RPM = On Time / Total Time = 3 / 14.6 = 20.5%

Wasted spark will double the duty cycle, since the "total time" will be divided by 2.