The time required to take the Visual Acuity test varies depending on whether you are taking the kids version of the test or the adult version of the test. Both tests will take under 2 minutes depending on how well you are taking the test. If you are taking the test well, the test will speed up. When this happens you will not complete the full line of Es shown on your smartphone's screen. If you are having trouble correctly identifying the Es on the screen you should guess in order to complete the test. The process is the same for the right, left and dual eyes in both the kids and adult versions. Since the kids version of the test is gamified it does slow the test slightly, but only slightly.