Float is defined as the amount of movement you have to either heel-in or heel-out. Speedplay systems allow for a large degree for heel-in and heel-out, Look/Time/Shimano allows for a maximum of 9 degrees. It's also not true that once you are adjusted you do not need float, because your leg move relative to your pedal throughout its pedal stroke, float is continuously needed. That said, it's impossible for a rider to adjust his own pedals with any degree of accuracy, bike fit session ought to do that for you.