That’s sensitivity, not shutter speed. Eye’s do not require time for exposure, but a quanta or intensity of light. This sensitivity is variable, but not in a time dilated way. Notice that you don’t see blurrier in darker conditions, unlike a camera. You do see in duller colors, as a result of higher engagement of rods instead of cones. The first are more sensitive but less dense in the fovea, and not sensitive to color. While a camera remains as colorful but more prone to motion blur. This is because the brain does not take individual frames of time to process a single still and particular image. The brain analyses the signals from the eye continuously, dynamically and in parallel from each individual sensor, cone is rod.

In other words, eye’s still don’t have, even a figurative, shutter speed.