20µs == 20 microseconds == 20 * 10e-6 seconds. 100ns == 100 nanoseconds == 100 * 10e-9 seconds. 2 GHz == one clock cycle in 0.5 * 10e-9 seconds. And that's how

20µs == 20 microseconds == 20 * 10e-6 seconds. 100ns == 100 nanoseconds == 100 * 10e-9 seconds. 2 GHz == one clock cycle in 0.5 * 10e-9 seconds. And that's how long that one comparison would take; not accounting for branch prediction and other interferring stuff inside the processor. It's not an attack, it's a joke.