How many times daily you open your PTC sites?

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in the beginning i thought it's enough to open a site only once in a day and click but recently i found that if i open one site several times in one day i find more and more new ads except for Neobux, this is true for every other site i use - Omnibux, ClixSense, PTC sky and others even in Palmbux several times i found additional ads to click for the day sometimes they double th daily limit did you encounter something like that?