He probably won't want to stand around all day - depends on the leg and also on the individual, but try to be quick and not leave them lingering.
This can be said of almost ANY professional photo session. The last thing you want is to be chimping in between shots, making slow minor adjustments, and taking more time than is absolutely necessary.
In a portrait session of this kind, normally you take 30-45 min to setup and 5 minutes AT MOST taking pictures. In 5 minutes I have 75-150 shots in 5-6 different poses to pick from. The different poses keep them moving and thinking, the SHORT time makes it feel very animated.
I hope you have great people skills... to me, THIS is *almost* more important than final picture quality, and is what defines a good portrait photographer, because you can make happen that difference between what is "too long" versus "short, pleasant and dynamic" even though both are a couple minutes of picture taking.
Cecil B. DeMille defined this concept best in terms of how I define a good photoshoot session... "Start with an earthquake and build UP from there..."
Your earthquake is that as soon as the clients walk into your door... you are ready to shoot *now*. You KNOW what you are going to shoot, there is absolutely NO talk of technical aspects, no major adjustments, no delays. You are dynamic, fun, fast, and 100% engaging of the client's needs with every click of the shutter.
Take it from there.
