What is the proper size of hardwood stem cuttings?

FAQ
Question: 

What is the proper size of hardwood stem cuttings?

Answer: 

The length of most hardwood stem cuttings varies from 4 to 12 inches.  However, the cuttings of some plants may be up to 30 inches in length.  The diameter of hardwood stem cuttings typically ranges from ¼ to 1 inch.  Each cutting should have at least two nodes.  The bottom cut should be made just below a node and the top cut one-half to one inch above a node.  (A node is the point on the stem where a leaf bud is attached to the stem.)