Google Docs Chrome Extension — TimeCamp
Start TimeCamp timers from individual Google Docs in Chrome.
Free
Start Timers on Google Docs Directly in Chrome — TimeCamp Extension
Track time on individual Google Docs, so you can answer how long a piece of work actually took – and how much it earned your business.
The Chrome extension adds a handy start button to Docs. Just start it when you open a document, stop when you're done, and the document's name appears as the note assigned to a time entry in your TimeCamp timesheet. That keeps time separate for each document, rather than lumping it into one vague block at the end of the month.
Free to use with the TimeCamp Chrome extension.