3 hrs is a bit excessive
my old sales manager used to say are you looking today or buying
(with a smile ) and when the punter says er looking,he would say
quickly, well its a good job its free today...
used to work a treat that did
i got taught the way to find out if someone was a messer or a buyer
and the golden rule was not to waste time especially if your busy
at the weekend with other punters mooching around