Time Tracker is tool for keeping track of your spent time on Google Sheets. Time Tracker uses your Google Drive and Google Sheets to save your time information.
You can create multiple Google Sheets files to track different activities to different files. Just start timer when you start your activity and end it when you stop. After this you can just give comment what you did while timer was on and send it to your Google Sheets. Or if you forget to start timer you can insert your time to the Sheets with manual time input. You can also inspect your times in Time Tracker and see sum of time spent and average time spent on session!
To see your times in Google Drive look for folder named time-tracker. From Google Sheets you can easily share your tracked times to a friend or export it as CSV data!