There is the ability to set a Time to Live (TTL). When messages which haven't yet been delivered, hit the TTL then they are removed from the delivery queue and will not be delivered. Businesses can use this to ensure that messages are delivered within a given time frame. Currently, TTLs are only supported for Message Templates. If the message is not delivered to the customer before the expiration period, the message will expire and will not be delivered. You will get a FAILED callback notification with error code 410 when a sent message expires. A delivery receipt will not be generated because messages that expire will not be delivered, therefore, no cost will be incurred from failed deliveries.
If the message is successfully delivered, there is no time control as to when a customer may reply to that message.