Answer : 30 days
Explanation : Beth got hired as a cocktail waitress, to be a seller-server she must be certified within 30 days. This 30 days delay is considered to for the certification holder to stay up on certain standards even after the certification is completed.
This ensure that quality and the validity of the certification process stays intact. It also makes it more trustworthy in the eyes of the consumers.
Conduct disorder is commonly found in men rather then women.
People become skeptical due to the overflowing abundance of scientific evidence that backs more proof with certain treatments. It makes people more comfortable over all if it is more tested. It would help prove theories if people were more skeptical, since they didn't think it would work previously.