Efficient way to log time in timesheet is to click on the 'green clock' icon shown on mouseover each task assigned to you.
Once the 'green clock' icon is clicked todo clock ticks. For each task, clock is running is denoted by icon next to task checkbox.
Once the user completes the task, todo clock can be stopped by clicking
'red clock' icon shown on mouseover each task. (Note : red clock will
be displayed only if the todo clock for the task is running).
To stop todo clock click 'red clock'
icon. Once the icon is clicked then automatically time (difference
between start and stop of todo clock) is logged in the timesheet
against your name.
You can also stop the clock and log time by clicking icon next to task checkbox.
icon is clicked todo clock ticks. For each task, clock is running is denoted by 
icon next to task checkbox.
icon. Once the icon is clicked then automatically time (difference
between start and stop of todo clock) is logged in the timesheet
against your name.