Google made $79B from ad revenue in 2016[1]. $79B in a year / 365 days per year = 218M per day. So GP underestimated by quite a bit.
Or put another way: http://lmgtfy.com/?q=google+ad+revenue
[1]: https://www.statista.com/statistics/266249/advertising-reven...
(Brought to you by Google Search: so ubiquitous it has become it's own meme.)