What is a macro second?

There is no such unit as a "macrosecond". The prefix may confuse some as it is used in "macroscopic" which is visible to the naked eye, but it is just referred to in time as a second. Some people may mistake "macrosecond" to be microsecond (which is one millionth of a second) and a microsecond to be a millisecond (one thousandth of a second).