Usualy when we have numbers on both sides we run a campaign for one full calendar day to have proper numbers, so that's basically half day + full day + half day, so both ends of the stats are covered. And when you compare stats always mind the timezones, they can be tricky when you have like 10 hours difference, it's not enough to compare just the days.
It is not possible to judge a test by the number of impressions or visits your camp received.
Let's say you are launching a camp in US and your paying $1 CPM, you are going to get traffic so that your budget will be consumed, but you are bidding tool low and so you'll get poor quality traffic. You should see some resullts at least on $3-$4 CPM or more.
Run your tests based on your offers average payout x10 or something, then start optimizing your camp since the beginning.
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