I can balance for only a few seconds so I usually unclip my right foot before coming to a complete stop. If I am waiting for oncoming traffic to clear an intersection, I can slow down to the point of nearly stopping (maybe a few inches per second) and "stand" without unclipping. My panniers vary in weight daily so I haven't even tried to master the track stand. Too afraid of losing my balance, tipping over and getting my melon squashed by a passing truck.