Network Key Rotation Interval : 3600 Or 0?

I'm curious to know how the "Network Key Rotation Interval" feature works in ASUS (and other) routers. I read on a few forums that setting the key to default 3600 seconds will add maximum security; but it will disconnect the network access at regular intervals. That's exactly what's happening on our network at CrazyEngineers and it's little annoying. I found some interesting information about this setting:-

1. It works only for AES encryption or TKIP+AES combo.
Question: Do CEans recommend some other encryption for secure wireless connections?

2. The key is automatically generated from the SSID and the password set for the network. Refreshing of this key does not mean that a new password will have to be entered every hour. However, it results into Internet connection being unavailable for some time at regular intervals.

3. The option can be set to 3600 or 0. If the network is continuously being used for streaming content (and boy, we do play a lot of Gaana.com radio here at CE Headquarters); the recommended setting is 0.

4. I understand that setting the key to a shorter value will strain the hardware. I'm considering setting it to about 2 hours (7200) or more.

I'd really appreciate if our CEans can throw some light on this setting and let us know what setting you've been using on your routers. I'm also looking at recommendations on what's the most optimal value of this setting? Will setting it to 0 heat up the router (if at all!)?