os.clock

Function os.clock
Returns the amount of time the Computer has been running, note that this may not be the amount of time the program has been running. the function os.clock() is useful for debugging, see the example.
Syntax	os.clock()
Returns	number, amount of time the computercraft computer has been running, in seconds.
Part of	ComputerCraft
API	OS

Examples

Example
Measure how long a custom function takes to execute
Code	x = os.clock() -- compensates for time already passed myFunction() -- function to be tested y = os.clock()-x -- calculates time change print(y)
Output	Time it took to run myFunction()