How Soon Did Dell's On-site Service Double Sales?

Michael Dell says Dell's on-site service doubled sales after about three months.

Dell had decided the company had to differentiate on the basis of service and created on-site service. Back then, if a computer broke, the owner put it in the trunk of a car and took it back to the computer store. The store shipped it off somewhere, and the owner waited weeks and weeks and supposedly got it back. Before the internet, the customer called Dell on the phone. If Dell could not resolve the problem on the phone, Dell sent a technician with parts to the customer's location to fix the computer on site. Dell offered on-site service all across the United States.

Dell thought sales would double the minute the offer was announced, because on-site service was so much better than what Dell had been doing before. Sales did not double instantly. After about three months, they doubled.