When should a Canadian applying for a visa extension in Thailand during the Phuket Sandbox program expect to apply?

A Canadian arriving in the Phuket Sandbox on February 8 should apply for a visa extension anytime during their stay, particularly if entering under the 30-day visa exemption. The extension costs 1900 baht and requires copies of the passport, entry stamp, and a photo. It's noted that a TM30 form is not necessary for a 30-day extension, but it is typically required for a COVID extension. Caution is advised as servers may be overwhelmed on February 1.