@Tod ********
thank you for the speedy reply. Yes, you are correct that I have entered on a 90 day Non- O visa.
So thanks for clarifying the 18 month issue as I had never seen that before so was surprised to see it mentioned.
So I will plan to use the 400k for my initial 1st extension and then use the monthly deposits for my 2nd extension.
So just one more question:
For the 1st 400k extension for seasoning purposes should that be in the bank account for 2 months before the application and 3 months after the successful application?