Can I do my 90-day reporting, visa extension, and multi-entry permit application at the same time in Chiang Mai?

In Chiang Mai, it's possible to complete your 90-day reporting, visa extension, and apply for a re-entry permit on the same day, especially if you have an ED visa. However, while you can attempt to start part of the process online, it may not always be reliable. It's usually advisable to arrive early at the immigration office, around 7:30 AM should suffice. Keep in mind that if you're studying at a private school, your extension will typically only be for 90 days, which affects the validity of any re-entry permit you obtain.