Wont work for 99% of folks. The lease is longer than the release/renew interval, meaning you will keep the same IP if possible for as long as possible.
Good luck tho.
One other way to force a DHCP refresh is to change NICs or spoof the MAC address. This pisses off some ISP-provided modem/router setups and forces a release/renew of the IP. Downside is it could result in you having to re-provision your service. Not a lot of fun @2am when tech support folks are out for coffee.