The full Reaction Time test is made up of six subtests or tasks that broadly cover the full spectrum of this broad ability. Most of these tasks are very short, so you can probably do all of them in one shot.

You just need a calm space, where you can be highly focused. Each task first presents the instructions, then the testing phase starts, and finally the results are presented quite immediately after each one of the tasks. You might actually continue the tasks in another day if necessary as the system will remember it.

Although you can do the test both with desktop computers and mobile or table devices, we do recommend using a computer. The reason is that touchscreens in general are not as precise as using the mouse. In any case, you may repeat the test as many times as you want, and you will be able to track the evolution of your results and the average result. This average result will be highly reliable.
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The test currently is mainly targeted at adults, but under-age kids can also take it if they want, as well as older people. Keep in mind however that reaction times do vary by age and the results are computed against a global datase mainly comprised of adults.

Since our test is available in all countries and in more than 40+ languages, we can say that it has a very diverse sample. Of course, segmentation of those results by country and also by age could be useful, but it could potentially make the results less precise if the sample size is low and could also become computationally expensive for us. Since our test norming is dynamic, we compare you with a sample size made up of the results of everyone that took the test, which as time passes will become a quite large sample.