I'm assuming you mean the upper jaw to be made longer. The labial ledge (philtrum area) is soft tissue. Technically, it does not get longer with surgery. However, at times, it can look longer. For example, for SAME technical length, when it's angled out, (usually angled out teeth can angle it out) it can look shorter in frontal view than it would if the teeth were on a VERTICAL plane or retroclined. It can also look longer when the upper jaw is brought forward too much if it stretches out the labial ledge and enough so to make it somewhat conVEX.