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The Nintendo Switch has been observed to hold on to IP addresses even after their expiration. My guess is that this is an oversight: likely the device enters power saving mode with a configured IP address and just sleeps through the expiration time. As the device seems to wake up once every hour, we enforce a minimum lease time of 1 hour, but only for affected devices. The rest of the network gets short lease times. https://twitter.com/zekjur/status/1263949112036282374