':return: An estimated transfer time for a file with the specified size.'

def estimate_transfer_time(self, size):

    before = time.time()
    res = self._exec_method('echo    w3af')
    after = time.time()
    numberOfRequests = (size / self._step)
    requestTime = (after - before)
    timeTaken = round((requestTime * numberOfRequests))
    om.out.debug((('The    file    transfer    will    take    "' + str(timeTaken)) + '"    seconds.'))
    return int(timeTaken)
