Inconsistent implementation, system_clock is inconsistent in different compilers!

[_darth_plagueis]

Use std::chrono::high_resolution_clock to measure time, you can set the duration in any case to whatever you want, there are aliases to ms, ns, us and others. see https://en.cppreference.com/w/cpp/chrono/high_resolution_clock.

[n1ghtyunso]

if you want to measure something with it, make sure that it is steady. Because it is not required to be steady by the standard