Display:
60 divisions (1 for each second)
Each division has 5 segments (300 segments per revolution)

Assuming that the clock spins at 3000 RPM:
50 revolutions per second
20,000 microseconds per revolution
15,000 segments per second
66.666666666667 microseconds per segment
0.018 degrees per microsecond
1066.66666666666667 CPU clock cycles per segment