Print time in miliseconds

aes-32bit/aes.cpp

@@ -206,7 +206,8 @@ int main(int argc, char* argv[])
     }
     const auto end{std::chrono::steady_clock::now()};
     const std::chrono::duration<double> elapsed_seconds{end - start};
+    auto milliseconds = std::chrono::duration_cast<std::chrono::milliseconds>(elapsed_seconds).count();
  
     std::cout << "AES (" << cycles  << " runs)\nElapsed time: ";
-    std::cout << elapsed_seconds.count() << "s\n"; // Before C++20
+    std::cout << milliseconds << "ms\n"; // Before C++20
 }