Accuracy of Keil Simulation time

Im using LPC1778 uC to generate a pulse of 500Hz from the timer interrupt routine.
I have configured the interrupt to interrupt every 200uS.
It enters the ISR on time.
But what i want to know is the accuracy of the keil simulation time shown?
Will it vary when actually executed on the hardware.Because the Logic analyser shows a pulse that slightly off than whats expected.
How reliable is the logic analyser graph,which depends on the keil sim time shown?

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