The 5-Minute Rule
In 2007, Dr. James Oldroyd's study at MIT and the Kellogg School of Management established what is now called the 5-Minute Rule: the odds of qualifying a lead drop by 100× within 30 minutes of first contact.
A follow-up study published in Harvard Business Review confirmed that most businesses respond far too slowly. The median response time across 2,241 companies was 42 hours. Only 37% responded within the first hour.
In phone-driven service businesses — auto repair, HVAC, roofing, dental, med spa — the window is even shorter. The customer has an immediate need. They are calling 2–3 businesses. The first one who answers wins the job.