Hi Mickeymaus
I appreciate your reply and never new there was a 7 day window, as I thought once you get a letter from bank you could reduce the 800,000 baht before you get the extension
the 15 days window seems very generous, so I will keep to the 7 days
I suppose Udonthani adopt a different approach because it is much less busy.
so I have been worrying unnecessarily
Thanks for all other replies