in high school, we ran 40s during soccer conditioning and god knows why. that presumably never happens anywhere else.
In my neck of the woods, sprints when training are normally much shorter in distance, and often initiate with contact (two players must break into the sprint after making a challenge type contact), or starting off from some type of disadvantaged situation (prone on the ground, behind a cone, etc.). It´s about reaction and getting to top speed ASAP. It´s not about time per se.