I took maybe 15 minutes -- long enough for them to find the frameset in Specialized's system and for us to negotiate a price. Actually, since I wasn't actually interacting when they were looking for stock, I probably spent less than 5 minutes with them on a $3,000 frameset. My wife picked up the frameset in its box.
5 minutes with them. 15 or 20 minutes total.
I do all my own homework on purchases. And I also do all my own mechanical work. Why? Because I'm more knowledgeable and because the quality of my work is better. It wasn't always this way. It took negative experiences at LBSs to drive me to this point.