The signal travels at close to the speed of light. Assume it's really slow (say,
half) and figure it out yourself.

Don't the schools teach math any more?

how much of a difference in cable length would it take to create a
noticeable phase difference between two signals coming from the
same source simultaneously? ie, wouldn't a 1000' xlr cable arrive
at the pre, recorder, etc. much later than the signal that only had to
travel through a 25' xlr cable?