Good day,
There is no actual time associated with the component “Optical Delay”. It is designed solely to produce a NULL signal at its output even when there is no signal at its input. Once a signal shows up at its input (after a few iterations) then the input will be carried through directly (no NULL signal will be produced).
If you want to create an actual time delay, the “Time Delay” component should be used (for Optical).
Cheers