Your arrival date + 89 days = the due date of your 90 days ( calendar days )
They won't tell you when . Because we don't know when is your entry date and when you are planning to come Thailand so it depends on your arrival ka.
Simple like that...
Yet : you can report that 15 days before the due date up to 7 days after the due date with no problem or fine .. so the time is flexible. To your convenience
Equivalent to 500,000 THB in a forigner bank makes you eligible so... 40,000 $ is yes ( show statement of your bank ) required up to the month you apply at and this is the financial requirements.
They did not ask how much income you make monthly.
They can also completely reject your file without issue you any reason of rejecting and also not offer you a METV.
So you may feel thankful not to lose the whole fee and that will be also completely legal as it is mentioned in the Website and application when you apply ka 😃
One more thing ka ..
You are not here to work as an audit the thai government and the embassies fee.
The money is going to the government and each payment slip has a code related to the embassy where the Application has been applied at .
The website you apply at is @ .go.th
Means it is a government website and under the ministry of foreign affairs of Thailand