import time


def measure() -> float:
    """
    Measure how much of delay this machine will add on average
    while performing a 200 millisecond sleep.
    Returns a float, indicating a delay in milliseconds
    """
    start = time.perf_counter_ns()
    time.sleep(200 / 1000)
    end = time.perf_counter_ns()
    delay = ((end - start) / 1000000) - 200
    return delay