How can I measure my daily usage of my macbook

Hey,
I would like to know how many hours I use my macbook on a daily basis. Is there any application which just starts a timer as soon as the mac boots and then provides an overview of the total time, average usage time per day etc.?
Thanks for your help,
Voxius

It is a small "but" to the suggestion from Adnan Z. If the code you want to test execute fast. You must put it in a for loop a execute it say 1000 or 10000 times. This because the timer tick resolution is 1 msec at the best. Windows is not a real time system, so you may also have some jitter in the Tick Count output
Besides which, my opinion is that Express VIs Carthage must be destroyed deleted
(Sorry no Labview "brag list" so far)

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How can I measure my daily usage of my macbook

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