If I arrive in Thailand from Australia on a 30 day visa exemption and want to extend my stay an extra 30 days, is the 30 day extension from the date you attend the immigration office or 30 days from the expiration date of the visa exemption? Ie Can I attend immigration a week prior and stoll get 60 days total or will they just give me 30 days from attendance date, meaning I shouldn't attend immigration until the last day of my visa exemption?