Found it!
The timeout is 20 seconds and is hard-coded into the GWT code for the bpm console:
http://grepcode.com/file/repository.jboss.org/nexus/content/repositories/releases/org.jboss.bpm/gwt-console/2.0.3/org/jboss/bpm/console/client/common/AbstractRESTAction.java#AbstractRESTAction
See line 124 - t.schedule(20000);
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