Many would assume that the top speed you can run a mile at has little impact on how fast you can run a marathon or even an ultra marathon.
However your top end speed does indeed affect how comfortable you are at longer distances.
The 100m and 200m events are considered maximal efforts. That is about as long as a person can sustain their highest power output and speed. Anything longer is considered sub-maximal.
In a 1500m event you may average 60% of your maximal stride power of a 100m race.