I actually found that if I am suddenly thrust upon going into a shopping center, ie. passing by one and someone wants to stop, my time span within is very very short, because my brain doesn't have the time to come to terms with establishing blase mode (I call it), and basically get myself into the right frame of mind before approaching. When I know I'm going shopping in a big center, then I have time to prepare and get myself into blase mode, then I literally cruise through the place.... the missus actually has to slow down to me, because if I pace through, I get anxious, if I blase through at a snails pace, even becoming one of those slow, annoying people, then suddenly I can keep myself relaxed, browse, shop, eat, drink, etc, then exit, without consequence. If I drop in on the center or find myself in it too long, then I can start to feel the consequences. You will find the same thing Ned... you will identify a pattern of how you need to approach, how long you will be able to shop for, etc.