Do I need to maintain a balance of 800k THB for 2 or 3 months before applying for my second year extension of my O retirement visa in Thailand?

Hi - I am on my first year extension of stay after having a type O retirement visa. I maintained the 800k balance for 2 months prior to and 3 months after the extension was granted. And after that it can drop no lower than 400k and I have kept it well above that.

My question:

Prior to applying for the next (second) year extension, I understand the balance needs to be 800K again -

for at least 2 months prior to application for renewal?

Or is it 3 months?

Reading the sheet from the immigration office looks like 2 months, while I see 3 months stated on other web sites. There is one site that says "keep in mind the next extension requires 3 months prior, unlike the first one", while the immigration office printout only describes '2 months prior and 3 months after'