 The peak angular speed of the eye during a saccade reaches up to 900°/s in humans; in some monkeys, peak speed can reach 1000°/s.Saccades to an unexpected stimulus normally take about 200 milliseconds (ms) to initiate, and then last from about 20–200 ms, depending on their amplitude (20–30 ms is typical in language reading).Under certain laboratory circumstances, the latency of, or reaction time to, saccade production can be cut nearly in half (express saccades).