Minimum Key Renewal Time

Hello
I'm using a WRVS4400N 802.11n wireless router with WPA2-PSK security. I would like to change the default key renewal time of 3600 seconds to something shorter (preferably 600 seconds), but I want to avoid connection problems. Are there any guidelines to setting the key renewal time?
I am using a maximum-entropy password made up of 63 printable ASCII characters, no SSID broadcast, MAC address control and a static IP for the (only) wireless client (which connects to a proxy server through an SSH tunnel). With the availability of programs like aircrack-np, kismet, etc. I would like to renew the encryption key as often as possible without causing any connection problems. With the safeguards already in place, I would imagine that changing the key every 10 minutes would do the trick. Does anyone here have any guidance on key renewal times?
Thanks!
S

Thanks for the great info...actually, I am getting drops occasionally but I haven't really timed them. I think it could quite possibly be hourly, so I'll check more carefully. I did experiment with a 1200 sec key renewal time once, and I noticed that it did drop more frequently, so I changed it back (and posted this thread).
For now, I will take your advice and leave the key renewal at 3600 sec. I have also upgraded the firmware a number of times since I purchased this Wireless-N router, but I've never configured it from scratch afterwards! I will do this and see if my dropped connections go away. I never had this problem until I bought this new computer for the kitchen which has a built-in wireless card. (Dell XPS 1). Before, I was using a Sony VAIO with a Linksys WPC4400N PCMCIA wireless adapter (which is a Linksys product match for my router), and it had no problems. I would love to find some resources to set-up this new built-in Broadcom 802.11n Network Adapter - maybe it's not configured optimally for the WRVS4400N Wireless Router I'm using.
Anyway, It's not that I'm protecting anything so critical, but Linksys makes it so easy to secure wireless communications properly. I say, why not? And by looking at all of my neighbors' SSIDs, I wonder why they don't at least take some basic precautions!
You're right though, 63 printable ASCII characters hashed down to 256 binary bits is probably plenty secure enough for a password. Plus, this computer is the only wireless computer I use, and it's using a static IP on a network with a subnet range of 1-6 addresses, which are all taken by my other LAN devices. The DHCP server is disabled, and my network is monitored by software anyway, so I can see a real-time network map of devices connected to it. I live pretty close to MIT, though, so you never know who's out there! The pseudo-random password I used is probably even stronger than you suggest, because it was generated using a Rijndael (AES) block encryption of never-repeating counter values in Cipher Block Chaining mode. Sure, maybe this is overkill, but what I love about setting up a wireless network is that you only have to configure a password once and then not worry about it!
Thanks again for the good advice, and now I'm off to upgrade my firmware again, and this time I will configure it again from scratch! Now, what was my password again?
Best,
Scott

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