My inbox at work is an ever-growing TODO list, only it's one that is written by other people. And my "Sent" folder is a list of people I need to "chase" to make sure they did what I asked them to do. I feel like this can take up as much of your work day as you let it: Getting to 10% of the things other people want me to do and nagging people who are, themselves, doing 10% of the things others are asking them to do.