Threads execution time

Could some one explain why second thread taking much lesser time for same process

public class Main {

  public static void main(String[] args) {

    final String[] test = {
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};


    long s= System.currentTimeMillis();
    new Thread(() -> {
      test[0] = test[0].replaceAll("E","  11111  ");
      System.out.println(test[0]+"  is test[0] for thread 1");
    }).start();
    long e= System.currentTimeMillis();
    System.out.println(e-s + " in t1");

    long s1= System.currentTimeMillis();

    new Thread(() -> {
      test[0] = test[0].replaceAll("E","  22222  ");
      System.out.println(test[0]+"  is test[0] for thread 2");
    }).start();

    long e1= System.currentTimeMillis();



    System.out.println(e1-s1 +" in t2");

  }
}