Okay, let’s tackle this. So Tim Walsh has 18 years of experience as an interior designer, which is a solid foundation. Skills like interior design, space planning, and kitchen and bath design are in demand. Location is Largo, Florida, which is a relatively affordable area. According to the Bureau of Labor Statistics, interior designers in the US can charge an average of $50–$75 per hour. Considering Tim’s experience and skills, I’d estimate his hourly rate to be around $75. This is slightly below the national average, which might be due to his location. However, it's still a reasonable estimate based on his qualifications.