Two Temporaries

using namespace std::chrono;
using namespace std::chrono_literals;

void work(int id) { std::this_thread::sleep_for(1s); }

int main() {
    auto t0 = steady_clock::now();
    std::async(std::launch::async, work, 1);
    std::async(std::launch::async, work, 2);
    std::cout << duration_cast<milliseconds>(steady_clock::now() - t0).count() << "\n";
}

The machine has 8 idle cores. Roughly what does this print?