Reliability of switching times of the Crydom D2D12 SSR

Testsituation is as follows:
Switching time of SSR1 is 5 milliseconds
then a pause of 1 millisecond
then the second SSR is also switched 5 milliseconds

Measurements and switching by two Arduino Uno's
Times are measured im microseconds
Number of measurements is 90

                                                                                             On time SSR1             On time SSR2                        In between time  (between SSR1 and SSR2
                                                                                                                                                                                                             there was a pause of 1 millisecond)

On time SSR1 and SSR2 was 5 milliseconds

Times in the table in microseconds