The line in RedisProducer

            $message->setHeader('expires_at', time() + $message->getTimeToLive());

Sums seconds + milliseconds, resulting in inflated TTLs.
I assume the expires_at is referring to the timestamp to expire at...
The 2 lines below the delivery one is divided by a 1000 to get back to seconds, when summed with time().

            $deliveryAt = time() + $message->getDeliveryDelay() / 1000;

Both are documented as milliseconds.

Seems that whatever we place in here will have a very long TTL... (by a factor of 1000). Every second of TTL is in reality a 16-17 minutes.

Is that intentional OR an issue?