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What you probably can do is automate the network capture. In fact Wireshark itself does not capture network traffic, it uses the program dumpcap for that. This command line tool can be launched from a script, at the time desired, and instructed to capture for a limited time (--autostop), 15 minutes in your case (or 900 seconds, so --autostop 900). The output file(s) can then be loaded into Wireshark for analysis.