@Shai *******
on the O/A Visa, each time you exit Thailand then come back in, you get stamped in for a further 12 months, so I'm that first year, you can exit/enter as often as you like. If you exit and re-enter just before the end of that first year, you'll be stamped in for a year, giving you almost two full years, depending on when your compulsory insurance expires as that determines the 'end' date.