If you hand out leases yourself (from a xDSL/Cable router/modem), check the DHCP config on the router, if it's your ISP then make them change this, it's absurdly low. You could check "man dhclient.options" if you think you can add it to dhclient.conf, but like the man page says DHCP lease options like that are usually not client-side configurable.
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