Hi, The multiprocessing.Process.join() method has a timeout argument but doesn't specify the units. My guess is that the units are seconds. It would be helpful to (1) specify the units and (2) if the units are seconds, specify whether floating-point values are accepted. For example: If timeout is None then the process will block the calling thread until the process terminates. Otherwise the process will block for at most timeout seconds (which can be fractional, e.g., 0.5), or until the process terminates, whichever occurs first. -- Mark Summerfield, Qtrac Ltd, www.qtrac.eu C++, Python, Qt, PyQt - training and consultancy "Programming in Python 3 (Second Edition)" - ISBN 0321680561