As a Home Stager in Pennsylvania and New York, I often like to track my time for Home Staging or Design Projects or to see how long it takes "behind the scenes" when I prepare for a staging job. For several years I've been using the free app HOURS TRACKER on my iPhone. It's so easy to use! One of my favorite parts is how easy it is to share time notations with others like coworkers or clients.
By setting up separate folders for each job, you can log in and out, adjust times as you go along (like taking a break for lunch) and even go back later and correct an entry (like when you forget to shut it off after a job is over).
It's free in the app store. Just look for the little green pig icon.
Do you use a time tracker on your phone?