I transferred recently yesterday 20k Baht to a KBank account from Wise THB account. It was about 5 seconds. The fee was 113 Baht. I change money on Wise to THB and I transfer THB and it is always almost instant.
The ask:thailand community, consisting of multiple Q/A groups with over 100,000 members, powers this platform. It is not an official government resource. Our members actively contribute to this resource, and while we strive for accuracy, we cannot guarantee its complete reliability. Assistance to travelers is provided as a community service.