So as far as I can tell - the
blingo winning times are automated daily. They seem to be once an hour on the same minute every hour.
So if this is true - use the search exactly one hour after the first winning results you get for the day, and try to use that time later in the day for your remaining searches.
Worth a shot anyway.
In case you don't know
blingo is a google based search engine that gives out prizes at random for using the service.
Check out
blingo 
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