mvn test very very slow

I have ten Maven projects and for each project I have to perform a specific test case for n times (with n very large). To run the test case I run the command mvn -Dtest=className#methodName test, but it is extremely slow. I can't modify the project pom.

Is there a faster command that works like the one written above?

I found this command https://maven.apache.org/surefire/maven-surefire-plugin/examples/rerun-failing-tests.html, but it stops at the first success of the test.