How long does it take to get approval after receiving a 'under consideration' stamp on my visa in Thailand?

The duration for visa extension approval in Thailand can vary. One user reported receiving their extension stamp six weeks after submission, with their stamp under consideration showing up after the initial wait. Additionally, it's noted that applicants should check the expiration date on their stamp, as approvals may not involve direct contact from immigration. Instead, one should return to the immigration office before the stamp's expiration for further processing.