How Early to Apply for O-A Yearly Extension?

[aBigSmile]

 

Greetings,

 

I'm failing to find any information regarding the time frame during which I can apply for an extension. 

The immigration office is Chiang Mai.

 

Does anyone know how many days prior to expiration I may apply?

 

Many thanks!

 

 

[DrJack54]

45 at CM

[Lite Beer]

30 days early at some offices. 45 Days at others.

Chiang Mai 45 days.

[aBigSmile]

1 hour ago, Lite Beer said:

30 days early at some offices. 45 Days at others.

Chiang Mai 45 days.

Many thanks! Cheers.