@Michael ******
there is not
To apply for the initial 90 day Non-O visa MOST offices only require the 800K baht in the bank on the date you apply (some require you prove it was transferred in from abroad and Jomtien requires it be in the account for 2 months before you apply)
The year extension you apply for AFTER you have the 90 day Non-O issued is the one that requires the banked money method funds to be seasoned 2 months before you apply (some offices say 3 but that is totally a FAKE made up rule that people won't challenge).