What time was my Xbox 360 switched on?

Last night, somebody stole one of my Xbox 360 wireless controllers, switching my Xbox on in the process. It would be helpful to know what time my Xbox was switched on, as that would tell me (and the police!) what time the burglery occured. The Xbox is still on, sitting at the dashboard. Is there any was I can see how long I've been idle for? Can my friends see this?

Thanks in advance.

Edit: Even though I now have the rough time that my Xbox was switched on, it would be useful if I could see the exact time. Is there a way to see the last few times you logged onto Xbox Live?

Solution 1:

It turns out that your friends can see how long you've been online for, roughly - "Username - idle for seven hours".