To report time spent on a task, you have to add a Progress Note to it (a special type of message/comment) — read more about Progress Notes:
You can also use the Time Tracker desktop widget to report time.
You can also define the Estimated Time for each task — the estimated or defined number of hours to complete it:
The time is defined in hours (ex: 3.5 hours is 3 hours and 30 mins):
You can display the Estimated Time and even measure it against the actual total time spent for a task (reported through Progress Notes) in the left panel, by adding the "Hours" column to it:
You can aggregate the time spent on tasks with the Time Report:
Find out more about it on the Time Report page.
You can also use our Time Tracker desktop widget to track and submit the time to 5pm:
Find more about it on the Time Tracker page.