Comment (by Roland Haas):

Before digging into the Python code, maybe it would be good to check both your simfactory/etc/defs.local.ini and simfactory/mdb/machines/thornyflat.ini to check if any of those sets a rogue maxwalltime for thornyflat.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2725/walltime-being-overwritten-to-24-hours