Currently in Chiang Mai on a single entry non-immigrant b visa. I’m going to the US on August 1 and coming back August 15. I know i need to go to immigration and get a re-entry exemption but my question is when should i do this? Is there a time frame or window, like must be used within 30 days, kind of thing? I start work full time this coming Monday and have today free to go to immigration but my trip is still 5 weeks away, won’t be back to Thailand for 7 weeks, wondering if that matters 😑 thanks guys!