Entered the Kingdom on October 25th on a Non-O Visa. This is my first visit. I have copies of my Visa, Passport pictures, TDAC and TM30. 
Trying to make sense of the stamps in my Passport. Is January 22nd my first 90 day check in? 
Immigration said I'm only allowed to be in the Kingdom for five months. Which is fine since I am here with my wife taking care of some loose ends pertaining to her mother. We have obligations back in the States and will be here to wrap up some business, travel a bit and then go home. 
Thank you
TLDR : Answer Summary
The user inquired about the implications of their Non-O Visa after entering Thailand, specifically concerning their allowed duration of stay and the necessity of a 90-day check-in. Comments clarified that they could potentially stay for a maximum of five months instead of three by applying for a 60-day family visit extension, provided they fulfill specific requirements, including presenting marriage documentation. It was suggested that the user should ensure they visit the immigration office before their initial 90-day visa expires to complete this extension.
90 DAY REPORTING RESOURCES / SERVICES
- Use the trusted Thailand 90 Day Reporting Service to get your in-person report done and mailed to you for as low as 375 THB (even if the online system doesn't work for you).
- For immediate assistance, contact Thai Visa Centre directly via LINE at @ThaiVisaCentre or Email them.
- Join the Thai Visa Advice Facebook Group to ask your questions, and get advice from others.