Right...
I have been using Transferwise/Wise for a few years.
It has always taken two days from my Nationwide Account to Bangkok Bank account.
I have read how people from other banks receive their funds "in seconds".
So posting on a Facebook Group there seems to be no rhyme to reason to this.
"Bangkok Bank is TW's primary banking partner in Thailand. If the transfer needs to show up as foreign/international in the bank book with the bank code FTT, you must use the correct reason for the transfer, which is "Funds for long term stay in Thailand". To be 99,99% sure, you must contact TW and tell them to tag the account to Bangkok Bank. Then they will always use Bangkok Bank as receiving bank instead of their other 2 banking partners, Kasikorn Bank and Thai Military Bank. I have used TW since 2017 and Bangkok Bank is the receiving bank. My deposits always shows up as "International Transfer" = FTT in my bank book and in my bank account online. If using other banks than those 3 banking partners, then every single deposit will show up as an "Interbank Transfer" or the equivalent terminology at other banks."
So - it appears that if you have Kasikorn or Thai Military Bank you will get a FTT/International transfer. - I assume the speed is also due to the way that these two banks fulfil their payments.
Sofar - There is no-one who has come up with a specific reason if BANGKOK BANK transfers can be done more quickly using Transferwise.
RAZZ