No sorry, I don’t think there’s any organised overview regarding this, so you’ll need to ask your local immigration or ask if someone has experience or knowledge regarding this particular immigration.
Have you checked with your immigration if they’ll allow transfers over sea without an affidavit letter from your embassy. Not all immigrations allow the income for extension without affidavit letter.
Formally it’s two months, but unless you have income in Thailand or your embassy offers to issue you a affidavit letter to confirm your income/pension, you’ll unfortunately need to prove 400K baht every year for your yearly extension of stay.
Just some immigrations accept income minimum 40K baht transferred over sea for twelve consecutive months for the extension.
If you don’t have any previous history of travelling in and out of Thailand, you should have no issues with doing two arrivals on visa exemption and stay for 90 days in total.