Is it better to extend a tourist visa before it expires or wait until the last day?

The discussion revolves around extending a 60-day tourist visa for a visitor from the UK, which is set to expire on January 7th. Community members advise going to the immigration office (Chaeng Wattana) as soon as possible, preferably before the expiration date on January 7, to avoid complications. Key points include that extensions can be applied for even before the current visa expires without losing any remaining days. Furthermore, if the visa expires over a weekend or holiday, the extension will still start from the original expiration date, with no fines for overstay if handled properly.