Typical visual response
Simple visual reaction measurements for adults often fall around 200 to 300 milliseconds. The test, device, stimulus, and sample all influence the observed range.
Compare like with like
Compare the same test version and input method. A phone touch result and a desktop mouse result include different hardware and browser delays.
Use several runs
Repeated runs make individual results easier to interpret. They reveal the effect of one distraction, an anticipated click, or changing attention.