Enter “how to tame the email dragon” in the Google search engine and about 2,300,000 results are available (in 0.50 seconds).

Fact.
The average length of an email is 50-100 words. Most emails are longer.[1]

Fact.
You spend at least 13 hours a week at the office[2] reading and replying to emails.
That is 650 hours a year![3]

Perspective.
It takes 12 to 13 hours to read John Updike’s Rabbit, Run.
Or (for non-readers) that is equivalent to a ten-episode Game of Thrones binge watching marathon.

Fact.
Most full-time employees work 1700 hours per year.[4] That means nearly 40 percent of your work life is engaged in reading and replying to emails.

NOTES:
[1] The Muse, Are Your Emails Too Long? (Hint: Probably), Forbes, March 11, 2014, accessed December 18, 2017. https://www.forbes.com/sites/dailymuse/2014/03/11/are-your-emails-too-long-hint-probably/#7e9f22965400
[2] Jordan Weissmann, Re:Re:Fw:Re: Workers Spend 650 Hours a Year on Email, The Atlantic, JUL 28, 2012, accessed December 18, 2017. https://www.theatlantic.com/business/archive/2012/07/re-re-fw-re-workers-spend-650-hours-a-year-on-email/260447/
[3] Megan Garber, You Probably Write a Novel’s Worth of Email Every Year, The Atlantic, JAN 8, 2013, accessed December 18, 2017. https://www.theatlantic.com/technology/archive/2013/01/you-probably-write-a-novels-worth-of-email-every-year/266942/
[4] Joe Weisenthal, Check Out How Much The Average American Works Each Year Compared To The French, The Germans, And The Koreans, Business Insider, Aug. 17, 2013, accessed December 18, 2017. http://www.businessinsider.com/average-annual-hours-worked-for-americans-vs-the-rest-of-the-world-2013-8