Checking email and calling/receiving phone calls can be serious time wasters.
Schedule to check emails three times a day; 1.) morning before begin work, 2.) lunch time, and 3.) again in the afternoon the last hour of work.
Make all of your phone calls at once and schedule a time each day. Even try and schedule all of your conference calls or meetings over the phone on the same day. If it becomes too much, schedule them over a couple of days. This is especially important to dedicate the free days to no phone calls as project days. The same goes for marketing. Pick a day of the week (where most productive) for your day of marketing.
Tuesday is my day! 😉