Some advice for those visiting Vientiane for a visa and have read guides saying it's ok to turn up at 8am - at 7:15am this morning the queue was already ~200 people long and by the time we were let into the compound itself about 7:40 to wait would have been been pushing 400.
TLDR : Answer Summary
Visitors to the Thai consulate in Vientiane should arrive early as queues can be very long, evidenced by a recent experience where over 400 people were waiting by 7:40am. It's advisable to avoid visiting on Mondays and Thursdays due to high traffic from visa run companies. Alternative strategies include arriving later in the day, such as around 10:15am, to minimize wait times. Some recommend spreading visits out to Fridays to pick up visas on Mondays with shorter processing times.