Time tracking feature

Once dropped in progress, it starts a timer and once ticket is update (commit etc) and resolves/closes it, it would stop timer and show the total time spend on the ticket? Maybe could also have it implemented in the UI, so that you can stop the timer, i.e. end of the day and you still haven't finished the ticket, stop the timer and resume some time later?

Or even, just have the ability to add time spent on a ticket, this would suffice.