What are you doing to be productive today?
How about segmenting your day? Think about how to divide your time and control disruptions. Disruptions are such a time waster! Maybe email is a disruption for you. If it is, think about how you can have better control over it.
One way is to check email at specific times of the day. For example, check email on a schedule. Maybe at 8am, 10am, 2pm and 4pm.
Depending upon your situation, you might put a note in your signature so that people know when to expect a reply from you.
Start to control the disruptions and you start to control your time!