I have a noun, "second", that I need to make possessive in the sentence,
It's like having a second's slower reflexes.
When I make it plural, the apostrophe comes after the s.
It's like having two seconds' slower reflexes.
However, my noun is actually a quarter second. You only use the singular noun when there is exactly one of it, so you use the plural for zero and fragments of the noun.
They finished the task with zero seconds remaining.
They finished the task with .25 seconds remaining.
Since the noun in my sentence is plural, does that mean that for the possessive the apostrophe comes after the s, or since it is not more than one, does it come before the s? (My intuition says it comes after.)
It's like having a quarter seconds' slower reflexes.
It's like having a quarter second*'s* slower reflexes.