Hey buddy,you asked very difficult question.seriously i never counted it,but whenever i open my browser,Google is opened by me.
I am a seo expert so we work with google so most of the time i spend my search with google .It's not limit for me because all time it open in my browser.
dont now exact figures but i do all my searching on google as it gives very effective result for it..
I use google all the time that is almost all 10to15 hours on computer searching some new things on this web site.
24 Hours ! I can't live without Google , Google is not just my need but I earn by bread and butter through it too !