If a file hasn’t changed in, say, 5 minutes

This seems like something easy but I must be missing it.
A) How do I tell Hazel: "ignore files in this directory until they haven't been modified (size increase, specifically), in 5 minutes"?
Is there a way to do that?
B) relates to A… is there a way to tell if Audio Hijack is still "using" a file, and only act on it if it is no longer "in use"?
Thanks!
TJ
A) How do I tell Hazel: "ignore files in this directory until they haven't been modified (size increase, specifically), in 5 minutes"?
Is there a way to do that?
B) relates to A… is there a way to tell if Audio Hijack is still "using" a file, and only act on it if it is no longer "in use"?
Thanks!
TJ