How long before applying for a Non-O retirement extension can I submit my Letter of Income from the Canadian Consulate in Chiang Mai?

The user seeks clarification on the timing for submitting a Letter of Income from the Canadian Consulate in Chiang Mai when applying for a Non-O retirement extension, mentioning concerns over the acceptance window for the income letter and the strict requirements regarding bank statements. Responses indicate that immigration may prefer recent documentation, suggesting that letters should ideally be dated close to the application date.