Delivery reports (DLR) usually take 24 hours to be updated.
It is worth mentioning that after Kuwait implemented mobile number portability (MNP) the delivery reports will not be accurate.
So they are not to be relied on to measure SMS campaign effectiveness or link open rate.
+ How long does Sender ID registration takes?
+ Is it possible to change my account number?
+ Why should you register Private SenderID for OTP?