FYI: Did my 90-day report online on Jan 11 and the email stated my next report should be on March 7 - which is 55 days later, not 90 (!) but it is the date of my annual non-O extension. Looked like a system mistake to me, but not so as today I was required to file another 90-day report at Chiang Mai immigration. So 90 days can sometimes be 55 days :))) Watch out for this!