How many days does it take to receive a letter from Singapore Immigration Bureau (in New Zealand)?

The worst-case scenario is to deliver it the next morning. If it is the kind of letter that needs the signature of the recipient, when no one is delivered for the first time, they will throw a small note on the mailbox to tell them where to pick it up or contact them. But this little note is easy to disappear. I have been in this situation before. I thought my letter would definitely be lost, because it's been almost a month. As a result, one day I accidentally found a letter in the mailbox, saying it was the last reminder, or I would return it to the sender.

Please call the post office and ask for the telephone number of your area.