This says people spend an average of 40 minutes per day on Facebook: http://techcrunch.com/2014/07/23/facebook-usage-time/
I can't find quite the same statistic for Google, but this says 22 billion minutes / 47 million vistors / month, which is about 15 minutes. Of which 60-some percent is YouTube. http://mediatel.co.uk/newsline/2014/08/07/22-billion-minutes...
Now thats two different countries, but I suspect the numbers are pretty similar.
This says people spend an average of 40 minutes per day on Facebook: http://techcrunch.com/2014/07/23/facebook-usage-time/
I can't find quite the same statistic for Google, but this says 22 billion minutes / 47 million vistors / month, which is about 15 minutes. Of which 60-some percent is YouTube. http://mediatel.co.uk/newsline/2014/08/07/22-billion-minutes...
Now thats two different countries, but I suspect the numbers are pretty similar.