What are the best days and times to visit Chiang Mai immigration for a 30-day extension on a SETV?

The post inquires about the best days or times to visit the Chiang Mai immigration office for a 30-day extension on a SETV due to recent location changes and crowd concerns. Comments suggest that recent crowded conditions have been observed, especially after holidays when the office was closed. One user recommends calling immigration for real-time updates on crowd situations, while another shares a personal experience of a long wait time.