Anytime when I feel confused or when something new comes on my way so on an average no where less then 40-50 times a day
i use google about 20 times a day, yahoo about 3 times a day. But google is my primary search engine.
Loads and loads. The only other search engine I use is Wolfram Alpha, good when you want a really accurate answer on a easy to describe question like "New York current time" My favourite thing to do is to whip out my phone and google the answer to a question I'm discussing with friends of family. I'm like, why argue about this, let's just find out the answer (I'm normally right.)