How long does it take for a world class sprinter to accelerate to his maximum velocity?

Is his acceleration constant? Roughly how many seconds does he take to accelerate to his maximum velocity and what will that velocity be?How long does it take for a world class sprinter to accelerate to his maximum velocity?
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There's a breakdown you can use. It gives the 10m splits from the Korea olympics a few years back.



They hit there best splits 50-60 meters into the race.



They accelerate a lot at first, then it levels off pretty much after 25m.How long does it take for a world class sprinter to accelerate to his maximum velocity?
No, the acceleration is not constant. The maximum velocity is achieved in a 100-m dash after about 60-70 m of completion.