How long does it take to get approved for the COE in Thailand if entering visa exempt from the UK?

When entering Thailand visa exempt from the UK, the approval process for the Certificate of Entry (COE) typically takes between 1 to 5 days. Responses from the community suggest that while it's recommended to allow a week for the entire process, it usually takes much less time, often completed within the same day or up to 3 days depending on the situation.