We recommend to read out the patch twice a day (more about this can be found here). The readout counter (the 0/2, 1/2 or 2/2 in the "Today" screen) serves as a reminder whether you have already read out the patch today.
There should be about eight hours between each reading so that the counter updates. Of course, you can read the patch more than twice (it also doesn't have to be exactly eight hours in between). The readout counter has no influence on the readout itself.