@David *********
you can either have 800k in bank 65k/month deposit from a 'bank'. I use 'bank' because WISE and my USA Investment Company are not acceptable. Regarding what periods money must be in the bank for your situation I am not sure - I can tell you that I was told as a pperson on a current retirement visa and want to switch to a monthly arrangement. I would need 10 months with a specified form from bank. Don't know where you are located but the volunteer staff at Chiang Mai Immigration are very knowledgeable and have the answers.