The duration format should be defined in the template to avoid having to override the controller

[xaviermarchegay]

ui-process-bundle/src/Controller/Admin/ProcessExecutionCrudController.php

Lines 59 to 61 in 2cd1286

	TextField::new('duration')->formatValue(function ($value, ProcessExecution $entity) {
	return $entity->duration(); // returned format can be changed here
	}),