My guess is that you'll have to change that in code
(org.opendatakit.aggregate.servlet.SubmissionServlet) and not in
Tomcat. If you aren't a developer, file a feature request at https://code.google.com/p/opendatakit/issues/list and perhaps the core
team can increase timeouts.
You might want to consider finding a more reliable way of getting data
to the server (e.g., go to a place with WiFi, use ODK Briefcase, etc).
Yaw
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