I'd tried doing that exercise in the past with pen an paper. I usually kept at it for a couple of hours. Then the time sheet would get lost (Have I mentioned I have a cluttered desk?), or I'd switch activities and forget to record the change over. Anyway, I always gave up by noon at the latest. Sometimes closer to 10:30.
This time I decided to try something new and change my tracking tool. Instead of reaching for my pen and notepad, I did a quick Google search and found a time-tracking tool called Toggl (https://www.toggl.com).
Toggl's basic services, the only ones that really interested me, allowed me to enter a project name and track how long I worked on the project. There was no software to download. When I was ready to go, I entered the project name and clicked start. When I was finished with it, I returned to the Toggl screen, clicked stop, and entered the next project on my agenda. It was so simple, even I couldn't manage to muck it up.
People who want access to more reports and analysis can upgrade their service for $5.00 per month.