I had posted the number of my searches not too long ago; last January I hit about 4.5k; or on average 1 search every 10 minutes every day for the whole month.
It was the month I had to submit my thesis.. the flow is rather simple; search, skim, search again, until an answer has been found. I can hit 5-6 queries in 1 minute. Then spend the rest of the time reading the content I found.