How long does it take for a certified check to clear when deposited in a Thai bank?

I guess I am confused.

I sold my house in AZ, deposited the check which cleared almost immediately.

You said your are “returning” which means you have been here before to reside.

If you have a Thai Bank Account then use a money transfer service. I use WISE. Then depending on your THAI BANK LIMITS, you can transfer everyday or all at once even before you arrive back.

I transferred over $50,000 in a few days back in 2020.

My bank does not have a limit IN. Other Thai banks limit transfers IN to 50,000 baht or less.

Hope this helps.

Also, lately, the exchange rate has been over 34 baht to 1$

I couldn't imagine the headache involved with trying to depositing a US check into a Thailand bank account.

Ask a friend to deposit it for you, in the US. I think my mail service offers that service. ( if you were wondering.

What is maximum amount of money to bring to Thailand without needing to declare it?

I have deposited a couple of checks. About a month to clear. Wiring money is better.

I banked checks back in the day and it was 3-6 weeks.

Any checks/cash in any currency exceeding $ must be reported upon departure from the USA to customs officials at the departing airport.

Following. Same situation. Also, do you have to declare cashier’s or certified checks at either border?

Make a copy for sure to document proof of foreign deposit.