Given Robert Piel's extensive experience of 65 years in graphic design, illustration, and art direction, I've estimated his hourly rate to be around $50. This is a relatively low estimate considering his experience, but it's also important to note that he is retired and no longer actively seeking employment. Typical hourly rates for experienced graphic designers can range from $75 to $150 per hour, but this rate is more suitable for a retired individual with limited work experience. Additionally, his location in Kennesaw, Georgia, may also impact his earning potential.