Here’s a simple approach: First, at the end of the day, review your calendar for the following day. Determine when you’ll be in meetings, on conference calls, or otherwise unavailable. Second, estimate how much time you’ll be able to allocate to your to-do items. Don’t forget to leave yourself time for lunch and breaks. Also, pad the estimate to accommodate unexpected delays - for example, impromptu requests for help from your boss and coworkers.

