Currently the stop timeout is hardcoded as 1 second at https://github.com/jenkinsci/docker-workflow-plugin/blob/b174d46226ef1095903f2e789355a3b216b46dda/src/main/java/org/jenkinsci/plugins/docker/workflow/client/DockerClient.java#L182

It would be useful to be able to configure this (ideally per-job) to allow jobs time to gracefully clean up. This is especially important when jobs are creating resources in remote systems.