If all three pumps shall dose once per day, the dosing times would be: 0:00 Pump 1, 0:07 Pump 2, 0:14 Pump 3.
So they don't dose all at once but in an interval of 7 min.
Alternatively with firmware > 5.00 it is also possible to define certain time points when the pumps shall dose (besides auto dosing).