Increase Default TTL of message in service bus

I have a service bus 'basic' tier queue, in which the TTL of the message is 14 days. So if I have a message which is to be read after say 20 days, how can I do that without changing my subscription?

Also, I read that the default TTL of message is 10675199 days and am not able to set the TTL for more than 14 days.

Thanks in advance

- Ranjit (If you found this post useful, Please "Mark as Answer" or "Vote as Helpful)