Google Latitude can now tell you how much time you spend at work and home. Latitude will set your work and home addresses by default using your location history. The address will very likely be inaccurate because it is usually based on cell phone tower triangulated location data.
You can let Google Latitude track your time spent at work and home more accurately by updating the work and home addresses. Here’s how:
Sign into your Google account, and go to the Google Latitude dashboard: https://www.google.com/latitude/b/0/history/dashboard