For about a week: 

• Monitor yourself in 30 minute increments for a week.
  
• Update every 1/2 hour: not at end of day. Keep track of things in 5 minute increments
• In preparation for your time diary, I'd like each of you to put together a schedule for me of how you think you're spending your time. This can be based on your calendar, and should include scheduled meetings, but also other things, matching all of the columns you plan on tracking in your actual time diary. It's important to do this before you start your actual time diary.
  

 Attached is a sample spreadsheet you should edit to reflect your own time sinks.