Wise doesn't work like other transfer companies. Mostly, they match transactions in your home country, with transactions in Thailand. They basically shuffle money around inside both countries to make everyone whole. That can take longer.
If you're looking for an instant transfer service, it's probably not your choice. The bigger the amount, the harder it might be to match. What time of day it is in both countries may affect the speed, as well. And also, what reason you choose for the transfer. Plus, which bank you use.
Rumor has it that Kasikorn is their local partner, but online sources tell me they have many local partners. A transaction may come into k-bank and then go to your bank, if it's not Kasikorn.
If you choose "Funds for long term stay in Thailand" for the reason you're transferring money, Wise will attempt to code your transfer as international, rather than a local transfer (remember, it might come into one Thai bank first, and then transfer to another, thus appearing as a local transfer). I'm not sure what effect that has on transfer speed but I'm guessing it doesn't make it faster
Some transfers may need to be coded as international for immigration purposes.
So, what bank you use, what time of day you transfer, how much you transfer, what reason you choose for the transfer, and what bank you use can all affect the timing. Bangkok bank seems to be slowest at this point.