Even if it is an "approximate" that still means around or close enough ( based off of what I know about definitions of words ) so if someone TRULY wanted to, they COULD spend an entire day circling/scanning the area until they found my actual house.
"
Every 14 days
Every 14 days there is a DHCP lease renewal that takes place that acts kind of like a handshake between the ISP and a household modem. If the connection is still valid the ISP will move on and not disrupt service via provisioning a new IP address."