Have you considered trying to capture the amount of time it took to get from prospective buyer saying "Let's talk about a deal" to discovering the final price ?

Have you considered trying to capture the amount of time it took to get from prospective buyer saying "Let's talk about a deal" to discovering the final price ? Since buyer's time is valuable, and wasted negotiating time frustrating, having a friction-free non-delayed experience would surely be a valuable data-point to many -- as in "I don't want to use a dealer whose average time-to-final-price is more than 30 minutes."