How long until queues are garbage collected when they have no messages?

OK.. making progress here but this one is stumping me.

On Apollo, if a queue has no more messages, and they're fully consumed, the
queue sticks around for like 30 seconds, and then it vanishes.

I have some code on ActiveMQ doing the same thing, but the queues are
staying around forever…

- how long do queues stay around for?

- what configuration directive controls this?

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