The other person offering you 'advice' is likely a black-hearted troll.

The two week period is normal, here's why.

Firstly, they sound you out with a verbal offer because all hires requires the Chief Executive (for stat boards) or Perm Sec (Ministries) approval. So if the candidate is not interested, obviously they won't surface it to the senior management for approval.

Secondly, HR handles quite a number of candidates as you can imagine. So they tend to try to bunch up the candidates for approval in a single email. This means collating and waiting for a few candidates before going up to the senior management to seek approval, as opposed to singular emails.

Once approved, that's when they can generate the letter of offer and get back to candidates.

Hope this helps!