Do you get immediate approval for a second 12-month extension of a marriage visa in Thailand, and does the under-consideration period apply to a retirement extension?

Q. Does a second 12 month extension of a marriage visa get provided on the spot?

-> No.

Q. Does this under consideration period also apply if instead changing to a 12 month retirement extension?

-> No.

Every 1-year extension based on marriage starts with an under-consideration period.

An under-consideration period is applied to 1-year extensions based on

raising a Thai child, supporting a foreign child, volunteering, employment by a standard (non-BOI) company, etc.

It is not applied to 1-year extensions based on retirement (in most provinces), studying, employment by BOI company, etc.