laptop usage hours?

[doub]

How to check Time/hours used for a laptop, My friend gave me his new laptop and now I am returning it to him, I just want to show him the usage hours. How to check it?

 

[rgd1101]

event view would show the login/logoff

 

[doub]

I am not a computer expert please tell me, how can I check the usage hours of my laptop please..