I'm looking for an application that keeps track of the total amount of time spent at the computer. It doesn't have to (and can't be) very precise.
If it doesn't seen any mouse/keyboard activity in 5 minutes it can assume I'm no longer at the computer.
I don't need and don't want to track on which applications I spent the time on. I really want something super simple, but surprisingly enough all the applications that I found do too much.