Polishing time

Sorry for very simple question from newbie, tried to search but I couln't find answer:

I'm using first time my PC with Sonus sfx2 + sfx2 white pad. So simple question is that if I'm trying to get rid off minor swirls how much time I should approximately spend on each 30'x30' area? Just and rough estimate i.e. 1min, 5 min, 10min? I red that it's fine when polish "flashes" but I don't know what this actually means as I could' see any "flashing" when I tried it. So was it too short time in each area? :thx
 
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