Auto mode: if ones/day, which hour?

Well, it maybe silly but I didn't find it.

I am using Ghl dosing pumps and some of them are contolled by a timer in a "auto" mode.

I was wondering, if one dose per day is used, which time should that be?

I mean, which hour of the day will that one dose under "auto" mode, will be added to the aquarium?

for pump 1 0:00:00, pump 2: 0:07:30 pump 3: 0:15:00 etc.

Once again, Thanks!