Their DHCP lease time is only an hour apparentlyIf they are using DHCP might need the lease to be released or wait for it to expire to switch to a new router. Would expect if you were on to support they would have released it manually or told you the expiry time. Spoofing the mac address would get round that aswell.
![Stick Out Tongue :P :P](/styles/default/xenforo/vbSmilies/Normal/tongue.gif)