See following article for background reference: https://community.alteryx.com/t5/Alteryx-Server-Discussions/workflow-exceeded-maximum-runtime-of-30-...
I have a support case (#00278355) advising unsupported changes to the alteryx.config file, involving an undocumented setting for chainedTimeout, as in:
<engine enableAutoLicensing="true" useServiceLayerComposer="true" chainedTimeout="10800"
This setting should be documented, supported, and made user-configurable through the System Settings GUI.