Listen for command timeout syntax?

I’m running docker containers for Node-Red and Rhasspy 2.5.11. I want Rhasspy to listen for 10 seconds for the next user utterance. When I POST a 172.17.0.3:12101/api/listen-for-command?timeout=10, or timeout=10000, to Rhasspy from Node-red, the timeout value seems to be ignored. I’m clearly missing something. What’s the proper syntax with an example, please?