First time in Bangkok and I will be flying NH806 BKK-NRT in business leaving at 6:50 AM. What time do the ANA counters open in Bangkok (can't seem to find that on the ANA website)? Does ANA use the Thai Royal Orchid Lounges at BKK? I am trying to figure out what time to arrive at the airport to check my bags, make it through immigration and security, and have some reasonable time to have some food in the lounge before heading to the gate. The Thai lounge opens at 5:00 AM. Am I cutting it too close if I arrive at the airport between 5:15 and 5:30 AM? How much time should I expect for immigration and security at that time in the morning?

Thanks in advance for any insight.