For our modern sensibilities it’s quaint and too subjective. These days, we like our etiquette served with a dose of exactness.
“When a lady does you the honor to offer her hand, take it with an air of grateful deference which will show how you appreciate the honor; do not drop it instantly as if the touch scared you, nor hold it so long as to cause her a feeling of uneasiness.”
Standard Book of Politeness, Good Behavior and Social Etiquette
Anonymous, 1884