DePriest, Jason R. wrote:

> Use tshark instead (http://www.wireshark.org/docs/man-pages/tshark.html).
> 
> Try
> -aduration:10800 (3 hours in seconds)
> 
> For writing the results to a file, you can either redirect the output
> with '>' for decoded stuff or just use '-w' to write it out raw so you
> can open it with Wireshark later.

...and note that neither Wireshark nor TShark themselves have any 
mechanism for *starting* them at a specified time.

However, the OS on which you're running it might, e.g. cron or at on 
UN*Xes.  I think there's some equivalent on Windows NT ("NT" meaning NT 
4.0, 2000, XP, Server 2K3, Vista, and Server 2K8), but I don't know what 
it is offhand.
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