"Internet Configuration Leased" -- every 30 minutes??

That's right. I took a look at my Time Capsule's logs (should be the same as those of the AEBS), and there's a line like this just about every 30 minutes:
May 29 20:15:53 Severity:5 Internet Configuration leased -- host <67.198.108.106/255.255.248.0> gateway <67.198.111.254> dns <66.90.132.162 66.90.130.10> wins lease <3600> domain <grandenetworks.net>
Seems excessive (and the host IP is the same every time). Is the lease figure "3600" in seconds? Even so, it shouldn't be happening every 30 minutes, should it?

After many hours on the phone with my ISP and two repair visits, no change in the DHCP lease. However, I was reading reviews of my ISP on dslreports.com and found a rep who was responding to complaints and giving his email address. I emailed him, and he put me in touch with someone who acknowledged the problem and reconfigured the DHCP server.

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    Feb 9 13:42:28 5 Internet Configuration leased -- host <192.168.11.2/255.255.255.0> gateway <192.168.11.1> dns <192.168.11.1> wins lease <86400> domain
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    Feb 9 13:49:46 5 Joined BSS 00:1d:73:8e:a9:48
    Feb 9 13:49:48 5 Internet Configuration leased -- host <192.168.11.2/255.255.255.0> gateway <192.168.11.1> dns <192.168.11.1> wins lease <86400> domain
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    Feb 9 13:53:42 5 Internet Configuration leased -- host <192.168.11.2/255.255.255.0> gateway <192.168.11.1> dns <192.168.11.1> wins lease <86400> domain
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    Feb 9 13:57:23 5 Internet Configuration leased -- host <192.168.11.2/255.255.255.0> gateway <192.168.11.1> dns <192.168.11.1> wins lease <86400> domain
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    Feb 9 14:01:03 5 Internet Configuration leased -- host <192.168.11.2/255.255.255.0> gateway <192.168.11.1> dns <192.168.11.1> wins lease <86400> domain
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    Feb 9 14:04:43 5 Internet Configuration leased -- host <192.168.11.2/255.255.255.0> gateway <192.168.11.1> dns <192.168.11.1> wins lease <86400> domain
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    Feb 9 14:09:28 5 Internet Configuration leased -- host <192.168.11.2/255.255.255.0> gateway <192.168.11.1> dns <192.168.11.1> wins lease <86400> domain
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    Feb 9 14:15:53 5 Internet Configuration leased -- host <192.168.11.2/255.255.255.0> gateway <192.168.11.1> dns <192.168.11.1> wins lease <86400> domain
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    Feb 9 14:19:32 5 Internet Configuration leased -- host <192.168.11.2/255.255.255.0> gateway <192.168.11.1> dns <192.168.11.1> wins lease <86400> domain
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    Feb 9 14:24:45 5 Joined BSS 00:1d:73:8e:a9:48
    Feb 9 14:24:48 5 Internet Configuration leased -- host <192.168.11.2/255.255.255.0> gateway <192.168.11.1> dns <192.168.11.1> wins lease <86400> domain
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    Feb 9 14:28:28 5 Internet Configuration leased -- host <192.168.11.2/255.255.255.0> gateway <192.168.11.1> dns <192.168.11.1> wins lease <86400> domain
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    Feb 9 14:32:25 5 Joined BSS 00:1d:73:8e:a9:48
    Feb 9 14:32:28 5 Internet Configuration leased -- host <192.168.11.2/255.255.255.0> gateway <192.168.11.1> dns <192.168.11.1> wins lease <86400> domain
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    Feb 9 14:36:07 5 Internet Configuration leased -- host <192.168.11.2/255.255.255.0> gateway <192.168.11.1> dns <192.168.11.1> wins lease <86400> domain
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    Feb 9 14:43:02 5 Internet Configuration leased -- host <192.168.11.2/255.255.255.0> gateway <192.168.11.1> dns <192.168.11.1> wins lease <86400> domain
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    Feb 9 14:47:17 5 Internet Configuration leased -- host <192.168.11.2/255.255.255.0> gateway <192.168.11.1> dns <192.168.11.1> wins lease <86400> domain
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    Feb 9 15:06:47 5 Internet Configuration leased -- host <192.168.11.2/255.255.255.0> gateway <192.168.11.1> dns <192.168.11.1> wins lease <86400> domain
    Feb 9 15:10:22 5 Disconnected from network.
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    Feb 9 15:10:28 5 Internet Configuration leased -- host <192.168.11.2/255.255.255.0> gateway <192.168.11.1> dns <192.168.11.1> wins lease <86400> domain
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    Feb 9 15:15:57 5 Disconnected from network.
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    Feb 9 15:16:02 5 Internet Configuration leased -- host <192.168.11.2/255.255.255.0> gateway <192.168.11.1> dns <192.168.11.1> wins lease <86400> domain
    Feb 9 15:19:37 5 Disconnected from network.
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    Feb 9 15:19:43 5 Internet Configuration leased -- host <192.168.11.2/255.255.255.0> gateway <192.168.11.1> dns <192.168.11.1> wins lease <86400> domain
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    Feb 9 15:23:23 5 Internet Configuration leased -- host <192.168.11.2/255.255.255.0> gateway <192.168.11.1> dns <192.168.11.1> wins lease <86400> domain
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    If your AirPort Express is configured as a "bridge", with Connection Sharing = Off (Bridge Mode) it is receiving DHCP services from the router that is ahead of it, in this case, probably the Buffalo that you mention. That would be the device where the lease settings would be adjusted.
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              Apple Computer, Inc. IR Receiver
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              [failed]          com.apple.systemstatsd.plist
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              [loaded]          com.anchorfree.ajaxserver.plist
              [loaded]          com.fitbit.galileod.plist
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              Default Browser.plugin
              DirectorShockwave.plugin
              DivXBrowserPlugin.plugin
              EPPEX Plugin.plugin
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    ChmodBPF - Path: /Library/StartupItems/ChmodBPF
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