We previously used Autotask for our ticketing system. It had a great feature for entering time, when you opened a request you could start a timer running, then while working on the ticket you would update the actions that you took, then close the timer. This could be done several times, so each time you took some action on the ticket, you would start the timer.
When you have completed the ticket and you close it, Autotask would then automatically calculate the total time spent on the ticket and update the time entry accordingly.
It would be great to have this functionality in Zoho Support.