Time a user is active on a PC during the day

Time a user is active on a PC during the day

Hi Guys,
 
Does anyone know if it is possible to get a report whuch shows the total time a user is logged onto their machine each day, where their computer is unlocked (ie in an active state)
 
I am getting requests to find out how much time users are spending at their machines activly working, and at the moment i need to manually look at the Login times each day, and remove any time i can see between a user locking and unlocking their PC during that login interval.
 
thanks
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