15 Secrets Successful People Know About Time Management: The Productivity Habits of 7 Billionaires, 13 Olympic Athletes, 29 Straight-A Students, and 239 Entrepreneurs

by Kevin E. Kruse

If you want to build great products, devote more than 50 percent of your work hours to product. Don't accept speaking opportunities if you can't justify them as benefitting your users or your company. –Mark Pincus is the co-founder and CEO of Zynga.