Nope. You can have the devices on for years if you are not seeing any issues and have no need for an IOS upgrade. That being said you may not want to go for years without doing any sort of IOS upgrade. Keep a check on security advisories. I personally have seen 6500's and PIX's with over 1000 days of uptime. These are not your average MS Server.
We have 6500's that have been running for over 4 years without a reboot, of course using old code.
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