title: Block port every twenty minutes for a couple of seconds
body: <p>I want to be able to block a certain number our home network's ports every 10-20 (arbitrary number) of minutes for a couple (again not really important) of seconds. </p>
  
  <p>Reason is my son playing computer games too much and he agreed to only play twice a week but instead plays almost every day. I understand its not "nice" to drop out of the game because then one is called a "dropper" or something by one's peers. (He often told me they would call him that if i just pull the plug). So by the method described above I intend to use this peer pressure style of force to make him honor our agreements. If i block the ports in the above manner he will always be able to start a game but then get kicked out of it after a few minutes and I hope he will therefore not try to play during the off-days and only during the days we agreed on. 
  I know i could just block them for lets say mo-thu and sa all day long but then it would be more of a forced control on my part. through the other method it's more of a peer thing which i hope he's more likely to adhere to. I don't want to forbid him to play I just want him to not want to play during that time(because then he ll continue to be called a dropper in those days)</p>